We had a wonderful stay at Michael & Mathias' apartment. Even though they could not meet us at the flat when we first got there we had all the information that we needed to get in and the place was exactly as we needed it for 4 occupants. We were able to stay a little later in terms of check out time as well which made it easier to catch our aeroplane when we were leaving. A short walk into the central part of Vienna, I highly recommend staying at this place for a very luxurious feel.