We have just enjoyed three nights at this hotel. Staff were very welcoming when we arrived and, although we were early, our room was ready and we could have it immediately. It would appear that there had been major refurbishment in the hotel - our bedroom and bathroom were fresh & clean. With BBC World available on the TV and free Internet access, it was just fine.
On our first night, we dined in the restaurant. Although it lacked atmosphere, the food was good and the service excellent. The glazed Dining Room gave a nice view over the square.
The situation of the hotel was just perfect - cathedral, opera house, Hofburg Palace, museums etc were all in easy walking distance.
The only thing that stopped me from giving this hotel an Excellent overall rating and Excellent for Service was the breakfasts. The two young staff, when unsupervised, were far from efficient; and at times quite rude. When an elderly lady mentioned that there were no glasses next to the orange juice, it was brusquely pointed out to her that there were more glasses on the shelf above where the hot food was served - at the other end of the room! And they charge €25 per person for breakfast! The answer is to take breakfast at one of the many coffee houses nearby!
Apart from the breakfast experience, we had a first class stay at this hotel, and we shall return.