My husband and I had a wonderful week-long stay in Vienna at Belinda's apartment. The apartment looks exactly as it does in the photos, and was very clean and well-maintained. The apartment is very quiet overall, though we experienced quite a bit of street noise over night. If you plan to do laundry, note that the washing machine is in a cellar, and the dryer was not working as of September 2012. The apartment does have a drying rack for washed clothing. It also has plenty of other amenities that make it feel like a home - kitchen pots/pans, flatware, a coffee maker, wireless internet, etc.
The apartment is conveniently located 2 blocks away from two tram lines, which made it incredibly easy to get downtown. If you're headed elsewhere, you can easily transfer from the trams to the U-Bahn at Karlsplatz, or, you can take an easy 15 minute walk from the apartment to the Pilgramgasse U-Bahn station.
Belinda very generously arranged our transportation to and from the airport. I really appreciated her responsiveness to all of my emails and requests. Her husband, who met us at the apartment and gave us the tour, is also incredibly friendly and accommodating.
We would absolutely stay here again on our next trip to Vienna and would highly recommend it!