Room was fine, and good.
On the very positive side: The A/S was strong and could keep the room down to the configurable minimum of) 20 degrees, despite it being 33-39% outside. That is the first time I have experienced an AC actually working when severely needed. The outcome was I slept good.
On another positive note was the morning breakfast buffet - which was quite nice. However, nobody was making omelets for you (then you know it is not approaching 5 stars ;-))
Another thing on the positive side. The hotel is laying on a quiet street, despite being close to the Prater center where train station and U-bahn is.
On the negative side: There was no fridge in the room (that was a surprise for a 4-star hotel).
I would choose this hotel again - but I REALLY hope that they are going to fridges to the room, that is a severe penalty from me.