My stay at Chris and Tina's place was really great! The apartment is well situated (about five minutes' walk from metro line U4 and ten to fifteen minutes from Mariahilferstrasse, one of the big shopping streets of Vienna) and really quiet. The view from the windows is on a yard so you don't hear any noises from the street and the place retains some coolness when the temperature is high outside. The apartment itself is quite comfortable and cosy, with a small but well equiped kitchen (with a microwave, cooking stoves and a dishwasher), a very nice shower, a washing machine and a convertible sofa to use as a bed (very confy as well). It is situated on the second floor (with no elevator, though Chris kindly carried my suitcase for me when I arrived). The hosts were always responsive and available for any queries I had. After staying there for about a month, I'd definitely recommand the place.