Question: Café Griensteidl was a traditional Viennese café located at Michaelerplatz 2, at the Hofburg Palace in the Innere Stadt first district of Vienna, Austria, during the early twentieth century, the café was frequented by many artists, musicians, and writers, including who, which was an Austrian author and dramatist?
Sentence (from "Café Griensteidl"): The cafe was founded in 1847 by former pharmacist Heinrich Griensteidl.
Relevant evidence: No