My pregnant wife and I had a very lovely stay at Ella's place. Easy to find, navigating the elevators was easy, and getting the keys was a breeze. She was also kind enough to allow us a morning check-in after our flight's AM arrival, very VERY much appreciated.
The location is perfect. A quick walk to the museums, nearby playhouses & theatres, and tons of excellent restaurants with a 5 block radius (excellent breakfast at Figar across the street, btw). Not far at all from Nachtmarkt either, pretty ideal spot to stay at in Vienna.
Hoping we can return someday