Maxim and his father are very helpful and they quickly respond to the messages. Their apartment is located just north of the Augarten and easily accessible to the city center and other places. The public transport is always on-time and accurate and you may travel by light rail (5, 33), underground metro (U4) or bus (5B), all stations are within the walking distance of the apartment. The place very clean and quiet, and of course has a well equipped kitchen. I fully recommend their place and I would definitely stay at their apartment.