I definitely recommend Chris' apartment as best stay at Vienna. If you want to have great location for city trip it's a very good choice. There's no problem to park the car near the apartment. Close to the metro station, where you can get quick to the most important parts of the city. Apartment is small but full of the important facilities (also maps and guides). Chris as a host is really helpful. I'm waiting for my next trip to Vienna and I hope that I will have the opportunity to stay in the same place:)