I just got back from a 10 day stay and the flat was lovely, great location - a short walk to Vienna's big attractions and lots of lovely cafés on the same street and the market just around the corner, as well as a U-Bahn station for easy arrival and more exploring. The host was very friendly and gave me a good recommendation for tea and cake for my day out as well as nice touches like maps and tourist guides in the bedroom, although a lot of the time I had the flat to myself. The bedroom is comfortable and quiet and the shared facilities (toilet, bathroom and kitchen) were clean and well equipped. I would definitely recommend this as somewhere for a single traveller to Vienna to stay, I would have no hesitation in requesting to book again if I ever find myself going back.