If you have any business near the Vienna International Center, this is a great venue. The front desk has someone at all times. It felt very secure with multiple card access points.
The best part is that the room has everything you need, including a kitchen, fridge, sheets, towel. No soap or shampoo, but there are grocery stores and convenience stores at a walking distance. There is also a TV that I didnt use, except to use the USB hub to charge my phone. It's extremely clean as it is cleaned by a third party company after each guest. Note that the room is very small. A couple can use it, but having a 3rd person or a child/baby would be too cramped.
Other amenities I liked include the study space on the top floor, game room, tables on the roof top, laundry room that you need to pay with an app to use, and the closeness to the U1 line (less than 5 min walk). The gym is amazing for a "hotel" gym. A yoga studio is there too. There is a full squatting rack (not a smith machine) that you can squat or bench press. Two sets of plates up to 20 kg. The dumbell set only goes up to 26 kg, but havng the squat rack there makes it ok. Lat pull down, back row, single pulley. Many many weight machines and different types of cardio machines (running, elliptical, stairs, row). The only thing they really need is a triceps rope. It would be nice to have a cable fly machine, but that's ok. Please get the triceps rope!
I had to make my reservation without any reviews because this place is so new, but I'm glad I did. As long as the price stays similar, I would definiely come back.