Question: In what district of Vienna is the hotel Elisabeth Gürtler-Mauthner manages?

full_context: Document 1: Vienna Hotels: Vienna Hotel Group Limited, operating as Vienna Hotels (, "Vienna Quality Chain Hotels," referring to Vienna, Austria) is a hotel chain in China, headquartered in Shenzhen North Railway Station, Bao'an District, Shenzhen.
Document 2: Margaret Stonborough-Wittgenstein: Margaret "Gretl" Stonborough-Wittgenstein (September 19, 1882 – September 27, 1958), of the prominent and wealthy Viennese Wittgenstein family, was a sister of the philosopher Ludwig Wittgenstein and the pianist Paul Wittgenstein. She was the subject of a famous 1905 portrait painted for her wedding by the artist Gustav Klimt (Stonborough-Wittgenstein and other members of the Wittgenstein family were among Klimt's most important patrons), which was sold in 1960 by her son Thomas and may now be seen in the Neue Pinakothek gallery in Munich.
Document 3: Tourist attractions in Vienna: The tourist attractions of Vienna concentrate in three distinct areas. The largest cluster, centred on Schönbrunn Palace, attracted around five million visitors in 2009, down from six million in 2008. Museums and exhibitions of Hofburg Palace accounted for nearly two million visitors in 2008, with a significant decline in 2009. The third, and the newest, cluster of modern art museums in Museumsquartier attracted less than one million visitors. Nearby duo of Kunsthistorisches and Naturhistorisches museums, located halfway between Museumsquartier and Hofburg, also reported around one million visitors. The Landstraße district, which lies south-east of the old city, is home to art exhibitions at the Belvedere Palace and the KunstHausWien.
Document 4: Signa Holding: Signa Holding GmbH (officially written as SIGNA) is Austria’s largest privately owned real estate company. Signa was founded in 1999 by the Tyrolean entrepreneur René Benko. Over the years, the two-man company with an initial focus on classic real estate development has become a pan-European real estate group with more than 150 employees and offices in Vienna, Innsbruck, Munich, Düsseldorf, Zurich and Luxembourg. The principal focus of the Signa Group of Companies is the long-term investment in real estate in prime city centre locations.
Document 5: Theater auf der Wieden: The Theater auf der Wieden, also called the Freihaus-Theater auf der Wieden or the Wiednertheater, was a theater located in the then-suburban Wieden district of Vienna in the late 18th century. It existed for only 14 years (1787–1801), but during this time it was the venue for the premiere of no fewer than 350 theatrical works, of which the most celebrated was Wolfgang Amadeus Mozart's opera "The Magic Flute". During most of this period the director of the theater was Emanuel Schikaneder, remembered today as librettist and impresario of "The Magic Flute".
Document 6: Leona Helmsley: Leona Mindy Roberts Helmsley (born Lena Mindy Rosenthal; July 4, 1920 – August 20, 2007) was an American businesswoman. She was known for her flamboyant personality and had a reputation for tyrannical behavior that earned her the sobriquet Queen of Mean. She was promoted by the Beber Silverstein Group and its co-founder Joyce Beber persuaded Helmsley to replace that title with Queen of the Palace Hotel instead.
Document 7: Hotel manager: A hotel manager, hotelier, or lodging manager is a person who manages the operation of a hotel, motel, resort, or other lodging-related establishment. Management of a hotel operation includes, but is not limited to management of hotel staff, business management, upkeep and sanitary standards of hotel facilities, guest satisfaction and customer service, marketing management, sales management, revenue management, financial accounting, purchasing, and other functions. The title "hotel manager" or "hotelier" often refers to the hotel's General Manager who serves as a hotel's head executive, though their duties and responsibilities vary depending on the hotel's size, purpose, and expectations from ownership. The hotel's General Manager is often supported by subordinate department managers that are responsible for individual departments and key functions of the hotel operation.
Document 8: Gretl Schörg: Born in Vienna, Schörg first trained for the profession of typist. In 1937, at the age of 23, she won a beauty contest and became " Queen of Danube ". That same year she made her stage debut in Ostrava at the Antonín Dvořák Theatre in the world premiere of Ödön von Horváth's play "Der jüngste Tag". She spent the next two years performing at that theatre, and at theatres in Karlovy Vary, Ostrava, Marienbad, and Vienna (Theater in der Josefstadt). In 1939 she joined the opera house in Aussig (now Usti nad Labem) where she became popular as a performer in operettas. She made her professional opera debut at that house as Hannerl in Heinrich Berté's arrangement of Franz Schubert's "Das Dreimäderlhaus".
Document 9: La Scala: La Scala (] ; abbreviation in Italian language for the official name Teatro alla Scala ] ) is an opera house in Milan, Italy. The theatre was inaugurated on 3 August 1778 and was originally known as the "Nuovo Regio Ducale Teatro alla Scala " (New Royal-Ducal Theatre alla Scala). The premiere performance was Antonio Salieri's "Europa riconosciuta".
Document 10: Elizabeth Christ Trump: Elizabeth Christ Trump (born Elisabeth Christ; October 10, 1880 – June 6, 1966) was a German-born American businesswoman and is considered the matriarch of the Trump family. She married Frederick Trump in 1902. While raising their three children, the early death of her husband in 1918 required her to manage his properties in order to support her family. She founded the real estate development company Elizabeth Trump & Son with her son Fred. The company, now known as The Trump Organization, is currently owned by her grandson, Donald Trump, who is the 45th President of the United States. Her great-grandsons, Donald Trump Jr. and Eric Trump are running the family business as trustees during their father's presidency.
Document 11: Hotel Sacher: The Hotel Sacher is a five-star hotel located in the Innere Stadt first district of Vienna, Austria, vis-à-vis to the Vienna State Opera. It is famous for the specialty of the house, the Sachertorte, a chocolate cake with apricot filling. There is also an art gallery in the hotel with works from the 19th century. The hotel is built near the former residence of Antonio Vivaldi.
Document 12: Mozartkugel: A Mozartkugel (English: Mozart ball), is a small, round sugar confection made of pistachio marzipan, and nougat, covered with dark chocolate. It was originally known as "Mozart-Bonbon", created in 1890 by Salzburg confectioner Paul Fürst (1856–1941) and named after Wolfgang Amadeus Mozart. Hand-made "Original Salzburger Mozartkugeln" are manufactured by Fürst's descendants up to today, while similar products have been developed by numerous confectioners, often industrially produced.
Document 13: Principe di Savoia: Hotel Principe di Savoia, or simply referred to as The Principe, is a five-star hotel in Milan, Italy. The hotel has long become one of Milan's Landmarks. Founded by the name of "Principe e Savoia" in 1927, a time when Milan had already established its position as financial center of the country, it soon became a home for businessmen. With time, celebrities of all kinds chose The Principe for their Italian stays: Edward VIII, Erich Maria Remarque, Aristotle Onassis, Evita Peron, Maria Callas; and in recent years Madonna, David Beckham and George Clooney, among others.
Document 14: Leopold Museum: The Leopold Museum, housed in the Museumsquartier in Vienna, Austria, is home to one of the largest collections of modern Austrian art, featuring artists such as Egon Schiele, Gustav Klimt, Oskar Kokoschka and Richard Gerstl.
Document 15: Elisabeth Gürtler: Elisabeth Gürtler-Mauthner (born May 7, 1950) is an Austrian businesswoman. She is managing director of the Hotel Sacher, Vienna's most famous hotel.
ground_truth: Innere Stadt first district