A lovely, cosy room in a wonderful apartment, David was extremely welcoming. The room was very clean and private, as were the bathrooms. When we asked him while booking, he even accommodated for an extra person as we were travelling with 3 people rather than 2.
We had some difficulty when we arrived for the stay, but David was so flexible with the check-in that it ended up being no problem at all.
The location is great; the room is located in a pretty and peaceful residential area, but also only a very short walk from the metro, so you can be in the centre of town very quickly. Would definitely recommend for a short stay in Vienna :-)