Not a good experience at all. Quite sure the Hotels.com reviews are manipulated, 4 star hotel with 8.4/10 is very very far from reality.
The hallways and elevators are very dirty, and it does not help that there is a sheet of paper next to the elevators describing how to rescue guests from them when they stop working, with different instructions for the two different elevators. My room was ice-cold, AC/heat pump doesn’t work. The blinds were bent and broken, half of the window was TAPED over with wallpaper.
Very clear that they want to keep costs to an absolute minimum. No soap next to the sink, one roll of toiletpaper, one pillow, no towel to dry your hands. No television connection so you’re only able to use a few of the LG tv’s apps, but most of the buttons on the remote don’t work. No Do not Disturb card, Housekeeping knocked 17:00 one day and 9:30 the next. They didn’t change any sheets or towels, didn’t clean anywhere. Very thin walls, can hear everything happening in the hotel and the neighboring buildings. Spend an extra 20€ per night and get yourself a different hotel in Vienna that is not a facade and a scam.