I stayed here for 3 weeks since I just moved to Vienna and I needed a place to stay while flat hunting. I had a lovely stay, everything was very clean, and the apartment is absolutely equipped with everything you could think of. Wiltrud and the rest of the people there are really nice as well!
I'd say that this apartment is kind of hostel-like, with 8 private rooms (if I remember well) and well-equipped shared areas. Several supermarkets are nearby, and the metro station is like 2 mins away with really good connections. I would definitely stay here again, and I will recommend it.