We had a really great time at Viktor's place. The apartment was beautiful and spacious, on the fourth floor of an apartment building, overlooking an inner courtyard, exactly as described. Also, the bed was very comfortable! The only downside we can think of is that it was sometimes loud during the night, because sounds would echo from the courtyard or neighboring apartments (we slept with the window open). The location was perfect, very close to the subway and tram and even walking distance from the city center (about 10 - 15 mins.). Viktor warmly welcomed us at the apartment and explained everything that we needed to know. He was also always available via email or sms for questions and replied promptly. We would definitely return and recommend it to anybody looking for a nice place to stay in Vienna :)