Opposite the Schönbrunn castle this big hotel is a nice spot for city trips. It is directly at the U4 underground station of Hietzing - 10 m away from center of Vienna Karlsplatz. It was about 800 meters to the hop on hop off bus but make sure you ask the hotel where it is or get a map. Good variety for breakfast and the local produce is amazing. Great location directly across the road from the palace grounds which are free. Bathroom is clean but should have been renovated as the shower is in the bathtub which is not convenient at all.