The hotel suited our purposes perfectly. The staff was friendly and helpful. You need to become familiar with public transportation to enjoy Vienna as a tourist if you use this hotel. There is an Underground station few meters away, but if that kind of thing intimidates you, consider another hotel.
The area around the hotel is quiet which makes it good for sleeping but you need to get to one of the main areas to have the best Vienna experience. There are a few restaurants and bars near the hotel and it was safe enough at night, but the action is elsewhere.