The apartment (Diefenbachgasse 60, apt. 14) was ok, looked like it has been renovated recently.
We where surprised to see that the entrance, acces hall and stair where in a state of disrepair. It seems that the building will be renovated soon (it was covered in scaffolding outside and in the interior court).
The apartment location is ok, close to U-Bahn (metro) and bus station and 20 min walk to Schonbrunn.
There are some restaurants and fast foods nearby, some which close around 23.00.
There is a Billa market near the apartment.