This hotel has all the charm and class of old Vienna.  My single room was functional and classy with a large bathroom.  The bed was comfortable, and it was all very quiet.  Breakfast was tasty and generous.  Every staff member was friendly and helpful, and I had pleasant, fun conversations with several of them over the course of my stay.
The hotel is perfectly located, near Stephansplatz, the U-Bahn, and many restaurants.  It is a pleasant 15-20-minute walk to the MuseumQuartier and about 25 minutes by Uber/Taxi to the airport.