I really enjoyed my stay at Armin's apartment very much. It is very well situated, close to the Schönbrunn Palace and the city center is not far away and well deserved with the tube.
Armin is really nice and helpfull, he speaks several languages like french, english and german.
The flat is so beautiful, Armin is really gifted when it comes to decoration. If you really want to feel the atmosphere of the city, it is the best place to stay ;)