We stayed here for 3 nights - 4 adults and a toddler. The apartment was lovely and bright and clean, beds were comfortable.
As one of the other reviews said a mirror in the bedrooms would be helpful as when we were trying to get ready in the mornings we all wanted to use the bathroom one at the same time.
Kitchen was well equipped and also had a seating area where we were able to have breakfast.
It’s about a 30-40 minute walk from the city centre, but if you don’t like to walk it is very close to a U Bahn station.
All in all we had a lovely stay in Vienna and would recommend Oliver and Raphael’s apartment.