I have a wonderful week staying as Philipp's guest: Thank you very much.
It is a very well equipped and very comfortable private apartment. It has a very spacious room serving as bedroom and sitting room (with a large comfortable bed, a separated very comfortable sofa, and a desk to work on), a small but perfectly equipped kitchen (and Phillipp offered to supply anything missing), and a very clean and well-designed shower/toilet room.
The hosts are very friendly and helpful.
While it is in walking distance from Praterstern (with U-Bahn and train connections) it is very quiet.
It is an ideal place for a couple or a single person visiting Vienna for holidays or business.