We were a couple and stayed 4 months on Tammy's apartment. We simply loved it and since the first night we felt at home. Mario went personally to the check-in in a late time, because our flight arrived at night. And he gave us all the instructions. Mario and Tammy were very kind and helped everytime we needed.
The bedroom is very confortable, with a large bed and a big wardrobe. The living room is very beautiful and wide. The kitchen is small, but has everything you need to cook really well.
There is only a heater in the living room, so we had to remember to let the bedroom door opened some hours before going to sleep so it could be warmer.
The location is also great. We were 10 minutes walking from the 1st district (city center), 8 minutes from wien mitte (a mall where you arrive from the airport train) and 5 minutes walking to the nearest metro station. Also there is a tram stop exactly in front of the building.
It was a perfect stay.