We had a great experience staying at Walter’s place! We were there for a week and the weather in Vienna was quite cold but it felt so good coming back to the apartment where it was warm and cozy! Big plus for properly heating the place during winter!
Other pluses: the location, even though it’s not central, it is easily accessible by train or by tram from the most important spots in Vienna; cleanliness was also on spot; everything we needed was there (for cooking, etc).
I definitely recommend Walter’s place!