I stayed there for only 1 night in january/2012 with my wife and daughter. The hotel is not so close to any tourist attraction : you need to walk 15 minutes to reach the Opera and the main streets. But the staff is very helpful and we had a great stay. I will consider this hotel in my next visit to Vien.

Fabulous accommodation with large comfy bed. Super duper buffet breakfast including smoked salmon. Bit difficult to find the hotel but otherwise excellent.

We stayed there for 3 nights and everything was correct. I liked the breakfast menu-many delicious things to choose from! However, the restaurant where the breakfast was served, was crowded and unfortunately I found some hotel guests sitting next to us haven't adjusted their behaviour and manners to the place!
Anyway, the rooms were spacious and ellegant. The subway is next to the hotel so although the hotel is not in the city centre, you can reach it in 10 minutes.
While checking out, we had some problems with payment and as a result, the hotel blocked our money from the credit card for a few days.

All in all, the hotel is worth recommending.

Close to trains and trams.... really nice hotel with friendly and helpful staff. Breakfast was great. Would stay here again.