Everything about my staff was perfect. The room size was just right for solo travel, and it was surprisingly one of the most comfortable mattresses I've been on in a hotel! The room was well maintained, the heat level was just right, and the shower was great.
This hotel is extremely well-located, easy on and off the U-bahn, and near the Naschmarkt, Secession, Strauss museum, and both the Musikverein and Stadtoper.
My only note for North American travellers: you put your room key in a slot on the wall to activate the lights!