Hannes' apartment was spacious and very functional - it had everything we needed. In the neighborhood are supermarkets, and the metro station is close by, so it's easy to travel to all of Vienna's highlights. I liked the nearby Augarten park, which is a good place to run.
The apartment did feel a little damp to me, but this could've been the result of the large amounts of rain we had. Other than that, we had a good time in Vienna. I didn't get a chance to meet Hannes, but he responded to my emails very quickly every time, and his friend Michail who opened the apartment for us was friendly too.