We had a nice time at Michael's apartment. It is very well located. Everything that you need (sight seeing, bars, restaurants, market, city center) is just around the corner. The communication with Michael was extremely easy and quick. However you should know that it is only one room which is part of a bigger apartment. While the area is pretty quite, it can get loud in the morning, when other people are leaving the apartment or other rooms are being cleaned. You should also know that the kitchen corner does only have one hot plate and that the bathroom is super, super tiny. Still it seems a good location for a few days to explore Vienna.