We stayed in Vienna for a couple of days.
The apartment was really nice, super clean, cozy. Everything was as described.
Even if it is close to the center, the street is silent, so you'll not get disturbed by cars in the morning. Also, House is in few minutes of walk from Tram station, which is really cool when you are tired or have luggage.
The host was answering all questions on time and was flexible for an earlier check-in.