We stayed for about a month at Josef. We didn't have the chance to meet him, but the communication was very good. The apartment is bigger then we thought, just looking at the pictures. Also a good point is the location: it is very good connected to subway, tram and bus. You have a pedestrian main street at about 3 minutes walk. The furniture is ok and the bed is comfortable. We were afraid that the heating will not be good, but the stove and the 2 electric heaters were enough.
Now to the not so good things:
-staying for a month meant that we wanted to cook often and we missed the oven. For shorter stays I don't think this is a minus;
-the neighborhood is full of turks, arabs and romanians. I felt like worse then in Bucharest, where I live. It was very safe, no problem. But I think I saw less then 1% of the people being austrians. There were turkish shops, restaurants, fast foods, travel agencies, cafes.. almost everything was turkish or arab.
Conclusion was that it was a nice stay and we recommend the apartment as long as you can overlook the neighborhood.