Ulli and Günther's apartment is a very nice place to stay in Vienna. It's a bright flat in building, 10 minutes away from the city center with a tram, so the location is really convenient and easy to access. The apartment itself is very neat, clean and well equipped.
Ulli and Günther were really friendly and helping, so I'd definitely recommend their place, if you are searching for a nice place to stay in Vienna.