We stayed at Stefan's apartment for 3 months and it is absolutely perfect. It is completely renovated and in an excellent shape. The apartment was spotless on our arrival and it had everything we needed for a comfortable stay. The furniture is comfortable, stylish and modern. The apartment is very bright, but also has roller shades that make the place as dark as you want it for the night!
The location is good, it is between the second and first rings of Vienna, in a very nice and clean (and safe also at nights) neighborhood. Walking to the Rathausplatz (the start of the old town) is only 10-15 mins depending on speed. Taking a tram (n. 46), which stops in the parallel street to this building takes you there in only 5 mins. If you want to go by metro, there is the Thaliastrasse station only 500 meters from the apartment. There are also plenty of shops and restaurants nearby.
Stefan is a very nice person, helpful and a great host!
We definitely recommend this place!