Best part was Ruzanna's quick reply. I had to change plans quickly and needed a place to stay. She replied within half and hour I had a place to stay inside an hour. Ruzanna doesn't speak English, but she's a champion at Google Translate and we got along just fine. My only complaint was that her Wifi was extremely slow, but she said she'd do something about that when we spoke at the end of my stay. Additionally I could come and go as I pleased, because she hands out a key to the room and the front door. Highly recommend her place, especially for short or unplanned stays in Vienna.