We thought we were going to a private house but we were booking an Aparthotel with no services: the building is full of apartments for booking.
Our apartment was on the top floor and was great; made us feel very comfortable and secure. A great option if you don't want to spend too much money on a hotel to sleep.
Not in the center but 5 minutes away from the apartment you have a bus (63A) and then a subway (U4) to the city. You can also see the Schönbrunn/Gloriette in a walking distance.
The communication was easy but the cleaning could be better.