Ulli and Günthers apartment is a very nice place, it is clean and there is a lot of room for two persons and everything is working perfectly in the apartment. The neighborhood is nice and quite and if you take a tram nearby the apartment, you will reach the city centre of Vienna within 10 min.
Ulli and Günther were very helpful with informations about the neighborhood, public transport and they were always available on mail or SMS if we had some questions.
So in total it was a good and positive experience in the Austrian capital :)