Roman was easy to communicate with at all times and was quick to respond to any of our questions. His place in Vienna is a little bit out of the centre but there is plenty of public transport nearby. If you enjoy walking, as we do, then everywhere is accessible, however when we were there it was rather too warm and we used the metro a few times. The flat that we stayed in was beautifully furnished and comfortable and was in fact better in real life than in the photographs. There is everything you need for a long comfortable holiday.
The only criticism that we have is that air conditioning would be good in the warmer weather. The flat faces a main road and is not far from a busy intersection so that noise can become an issue if you open the windows. In addition there is also a bit of noise from the cafe across the road. This would not be a problem normally because the windows are double glazed and very efficient, but in the hot weather we had to leave them open. Unfortunately there was also road works during our stay which compounded the problem.
However, that being said, we had a very comfortable stay in Roman's apartment and would recommend his place to anyone planning a visit to this beautiful city.