My wife, 1 year old son and I greatly enjoyed our time spent in Alexandra and Stefan's apartment. Everything was as described, as well as new and working as it should. We have also enjoyed the bed and woke up every morning feeling rested.
We had great access to both Prater (lovely park) and Stephansplatz (by U3) and enjoyed the area's facilities. We recommend going to the 34th floor during the evening and admiring Vienna from way up high.