This is a beautiful hotel with everything that you would expect from an old style Viennese hotel in terms of room size and furniture. It is located in the most central position which meant that we were able to visit all the main sights on foot.
I would have given it five stars but for the fact that the price of the breakfast was ridiculous at 25 euros and nothing special. The breakfast should have been included in the cost of the room. There are plenty of nice coffee shops around where we had excellent breakfast for half that price.
Having said that I would recommend this as a great base for visiting Vienna. There is free WiFi in the hotel as well.