Rosemarie and Franz were great and very caring hosts, and comfortable was their offer. My girlfriend and me stayed long-term during a semester of studying, and definitely can recommend it for this purpose. For details of furniture etc., please also read the comments below. Actually all necessary every-day facilities where provided (from tools over plates and sheets to a piano). I also have to highlight the location: 15 min to main University, 10 min to two of Viennas most beautiful parks. Also: very, very friendly neighbours, with whom I befriend during our stay.
But however, despite the very positive experience with Franz and Rosemarie, I decided not book over AirBnB company anymore, as long the regulative situation doesn´t change. Despite the really undeniable advantages which convinced me at the first place, AirBnB still refuses to cooperate with the city of Vienna: It pays less taxes in Austria than a common Kebap stand, it is a core cause for rising rents in the fast growing city, and many hosts (very much unlike R & F) feel not obliged to stick to the rules, as every usual hotel does. Also, there is no AirBnB employee you can talk to personally, if a problem occurs - only a rather useless FAQ sheet. All problems (like e.g. a emergency case with a stuffed toilet costing a considerable amount of money) were agreed upon successfully between me and Franz, but I still don´t know which legal roll the company would have played in between, if Franz wouldn´t have been so cooperative.
Thus, as good the experience has been in this very case and as much I want to recommend Franz&Rosi, as important it is not to forget the disadvantageous side of the company and what it means for the city.