Booked this hotel based on the many favorable reviews on Trip Advisor. It did not disappoint! I had a single room that had ample space, a comfortable bed, a large bathroom and was very quiet. The location was excellent for walking around Vienna and for using the metro. The Karlsplatz U-4 metro stop was a very short mostly underground walk to the hotel. Used the S-7/u-4 metro combination to travel from/to the airport for 4.2 euro. Very nice continental breakfast buffet. Highly recommend for Vienna visitors. In interested, the ho-on/hop-off bus departs next to the hotel entrance. Hotel is on second floor and need to push hotel mailbox button to unlock the door.