The flat was really nice. We've stayed there for two nights. It's really close to the castle Schönbrunn. If you want to go to the city, you can take the bus in front of the flat, or the subway which is 15 minutes to walk.
The flat was clean and we had everything we needed.
Only the street right in front was a little bit loud at night. But thats ok.
If you're searching for a good stay, choose this one!