Pictures are better than a thousand words, and the photos of Christophs's apartment say it all. It is immense - very spacious with lots of natural light, especially the front-facing living area and bedrooms. The high celings and airiness of the apartment were particularly welcome since our group of five arrived in Vienna during the week that saw blistering temperatures in the city.
The location is even better, between Volkstheater and Rathaus, which means that you're no more than a short (15-20 min) walk or metro ride away from all the sights and attractions that Vienna has to offer, particularly the Museumquartier. There's a handy Billa supermarket opposite the apartment, but there's also lots of eateries around the backstreets of the building block.
Although we did not meet Christoph or Dennis, the communication between all parties was superb. Christoph's clear instructions meant that getting into the building and apartment itself was hassle-free and very simple, always a welcome after a day's traveling. All-in-all, an excellent experience and thoroughly recommended. Many thanks Christoph and Dennis!