Very good!
Didn't have the pleasure to meet Nenad personally as he was out of the town. But we talked via phone and he is very informative and friendly, he told us how to get to the apartment and how to get the apartment key. (His friend living in the same apartment building gave us the key). The apartment is modern, clean, quite big and fully furbished. Its very warm inside (outside was -5 celcius) so we slept very well. Good wifi connection available. And the location is very near the metro station, only 5 minute walk, easy to get to the city center.
The room is close to apartment building entrance and street so sometime you canhear car passing but it is a small road so not a problem.
Very nice place definetly will recommend to my friends visiting Vienna.