Great place, great communication and checkin/checkout! The apartment is central and its very easy to get around Vienna, as the u-bahn subway and tram- stop is across the street. 10 minutes walk to most stores, cafes, bakeries etc.
Only minus in my mind is the traffic outside. On hot summer days, with the windows open, its a bit harder to fall asleep for the "light sleepers" Except from that we had a great stay. Everything worked well, the apartment was clean and pleasant. Thank you, Michael!