I stayed at Ranier's flat while attending a conference at the Vienna International Center. The flat is well located near a U1 stop and is easily walkable to the city center. It was a great location for attending a conference. The flat has a very nice kitchen and living area and is located on a quiet street. Ranier was very responsive to email, met me a the time planned, and was happy to recommend things to do in Vienna. Overall I would highly recommend this location for people visiting Vienna.