The place was much closer to the center than we expected: 5-10 mins in the Ubahn, and that was a lovely surprise. We really managed to explore most of Vienna in 2 days and a half very easily as a result. The U4 even goes directly to Schönbrunn Palace. In the apartment, we especially loved the fresh coffee that was provided. Emil and Faigy also agreed to let us check-in one hour earlier and that was a great help.