Our holiday (we were in 3) in Vienna was fantastic! The apartment is very big, and it had all we needed, as written in the article. The quarter is really calm, both day and night. The distance between the apartment and the u-bahn (underground) and the s-bahn is not so long, it takes ca. 5 minutes, and to arrive at the Hundertwasserhaeuser it takes the same. There are 2 supermarkets at "the mall" (in the u-bahn station), and one of them is opened at every hour, and there are also a Billa in the proximity.
Rainer is really nice and kind, and was always helpful. If we will return in this beautiful city we'll certainly return there!