To start off with the many positives: The staff were all exceptional, very friendly and helpful; the location is superb, a short distance walk to Stephenplatz and also near many metro stations; the room/premises were very clean; breakfast was delicious and it was nice to have different options everyday. There are nice little breakout areas throughout the property which are great to just hang out if you don't want to stay in your room.
A few minor points: like others have commented, I did not like having the sink in the bedroom. It really isnt practical at all. But I found out subsequently that you can request a room with a more conventional layout. I would suggest it to anyone planning to stay. Also, it would be great to be provided with disposable slippers like many 4/5 star hotels do. There weren't any in the room and we had forgotten to pack ours. Finally, it would be nice if the reception could be staffed for slightly longer in the evenings, maybe until 11pm We were never back in before 9pm and there were questions we wanted to ask the reception but there was nobody there. There is something nice about being greeted by a friendly face at reception when you return back to a hotel in an unfamiliar city.
Overall we would def be happy to stay here again, but in a room with a more conventional bathroom layout.