Robert is awesome: prompt in responding to questions, attentive to our every, presumably annoying touristy question ("where's the this, that, and the other thing?"), and more than helpful on all other fronts.
The only complaint I have is architectural in nature and likely the result of the fact that we stayed there on New Year's Eve/ New Year's Day. Because of the way the windows are set up in the house and the way the noise frequents between neighboring apartment dwellers, if said neighbors decide to party into the night, you are well... not going to sleep. The light travels into your room and the noise is heard as if your in the neighbors house.
All that said, this spot is perfect for crashing in Vienna, only .4 miles or so from the tram to the U3 one to the city center where all the action is.
Roberts spot is awesome just be ready to not sleep if the neighbors decide to stay awake all night and blast music.