A disappointment. 75% on the hotel, 25% on Hotels.com.

A 20-minute queue for coffee in the breakfast restaurant. It was overcrowded with people the two first mornings.
Two out of four coffee brewers were out of order. The queuing caused the guests to use double time on their breakfasts. Thus, the overcrowding and wait for free tables.

The coffee maker in the room was broken. Nobody was fixing it.

Always a long wait for the elevator. One of two has been out of order during the whole stay.

The “studio suite junior” was not as described in the photos. An extra bed was also taking up floor space. Our room was similar to your presented photo of a “superior room”, which was cheaper.

A small thing; there is a pole for the shower head, but no hook for fastening the shower head on it.

The bar was closed, even if it were mentioned in the hotel overview.

There was no restaurant in the hotel.

There was no lounge for groups to gather.

Communication through Hotels.com about the transfer service from the airport was unanswered. I called the hotel before departure from my home airport and got an answer that we could just get a cab from outside the airport.
The hotel told me that they could not answer on the contact page on Hotels.com.
I chose to buy train tickets. When waiting for the train, a chauffeur from the hotel emerged as a genie of the bottle. Had already bougt train tickets

Overall beautiful hotel, good friendly service. Great breakfast, although sometimes felt a bit crowded.
Not in the tourist area of Vienna, but very close to public transportation. Not a walkable distance to the center. Supermarket Billa just in front of the entrance. A few additional supermarkets around, as well as basic dining options - McDonalds, pizza. Big nice room, good enough for family of 4. Value for money as fare and good.
For the cons - location is not central. The water pressure in the shower was weak, not a pleasant experience after a long day of winter sightseeing.The beds were not comfortable - matrasses are way too soft, had trouble having a good sleep. Both elevators were broke - one for the whole period of our stay, the second and last broke a day before our check out. Had to climb 5 floors several times a day and handle the suitcases on our way out - seriously unacceptable. Overall, nice, safe and beautiful hotel.