During our stay Nick was not in wien, but he was always reacheable through email and answered to all our questions. In fact, we did not have any problem with the apartment. We were in two and the apartment is large enough and it is nice like it appears on the ad. The area is nice, not far from the historical center and very convenient, it has also an underground stop nearby. We were going around by bike, the center was something like 15/20 min biking. It was a positive experience, we recommend Nick's place.