Amazing find! Everything was exactly as it should be. Boris' place was 5 minutes to the central station, Hauptbahnhof... meaning that transfer to and from the airport took 15-20 minutes by train. A Billa market is just around the corner for your daily groceries and morning to-go coffee and, if you rely strongly on your feet, everything is at a walking distance: 20-30 mins to Sephansdome , Museumsquartier, Hofburg aso, 7 mins to Belvedere, approximately 1 h and 10 mins to Schonnbrun, 1 h to Haus des Meeres, 45 mins to Hundertwasserhaus. If not, you have bus/train stations extremely close-by.
Boris' home was extremely clean and cozy and all you can hope for to get a good rest while in Vienna. All you need is already provided for, the bed is comfortable and the small balcony is amazing for a late night glass of wine or a strong morning coffee. There is no noise at all in the neighborhood. We slept with the windows open and couldn't hear a thing.
All in all, we'd definitely recommend this place to everyone and would surely stay here again, should we ever decide to return and see everything we have missed the first time.