We had a great three night stay at Dan's apartment. The location was great - easy to walk to all of the main sights and close to a great underground tube station. We didn't meet Dan but he answered all of our questions quickly and he sent clear instructions on how to access the apartment. My only negative comment would be that we had two single duvets rather than a normal king sized one, which was a bit annoying. A minor point though as the bed was comfortable and the room was lovely and warm. I'd definitely recommend Dan's place as a good value place to stay in Vienna.