We did not meet Dan in person, but he was extremely responsive and was really clear about house instructions etc. The location was the best part of this apartment. We literally just walk out, cross the bridge, and we're at city centre. The first night we forgot we had booked the Opera, the location made it possible to catch it last minute. It is also very convenient to take a stroll downtown before bed. The apartment itself is very spacious (especially the entrance); it could easily fit 6 people comfortably. There were also extra pillows and blankets in the closets. Overall, this is a great place and I'd recommend to anyone visiting Vienna short or long.