Communication with Andrei was excellent, he gave us accurate information about the apartment and how to get to there. He was flexible regarding the check-in / check-out times (which helped us a lot!). He gave us a concise explanation and helpful tips about transportation, close grocery stores, coffees and etc.
The apartment was clean and homey - true to its name and just what we needed. We cooked almost all of our meals there and the kitchen was well equipped for our purposes. The neighborhood and the building were nice and quiet (there are a few erotic shops around if it's a bother to anyone but it wasn't noisy or flashy or anything like that).
The location was perfect for us. Not inside the city center but 5-10 minutes away from it by foot, bike and public transportation. There are two close subway station nearby, one of them quite central.
Overall we had a great visit in Vienna, part of it, undoubtedly, thanks to staying in Andrei's place.