The apartment is simply fantastic! Clean, fully equipped, very spacious, it is perfect for a long stay! It's also in a great location, close to a lot of supermarkets, shops and public transportation.
I think the most enjoyable aspect was the view from the bedroom, which overlooks a nice Viennese backyard, that is always quiet.
Lastly, Gero and Lisa are excelent hosts, as they quickly responded to any question that we had.