 nothing
 After booking and reading all the reviews we were a little bit worried Lovely old fashioned hotel The room was cleaned bathroom dated but cleaned We asked for a quiet room and no smoking which we had Downside and not the hotel fault it was 40 degrees in Vienna so at night it was still hot in the room A little bit cooler when windows were opened but got the traffic noise No A C Location great only 10mIn walk from the tube station and 20mIn from the town Our 9 years old daughter managed to visit Vienna during the day and walked back to the hotel at night Receptionist pleasant Lift no problem WIFI we had free WIFI in the room Very slow but at the end of the day we were on holidays so access to internet for us is not a major issue 