Can only confirm the previous reviews - the place is very clean, modernly equipped, self-check in is super easy, it is well connected with the public transport (70m from a tram station, 6min walk to the nearest metro on Mariahilferstr.). It is easy to get to from the main train station - just one 15min bus ride. For the sporty ones it is about 15min walk to Museumsquartier. Billa and Lidl supermarkets very close, some good restaurants around as well.
Bed is big and comfy, wifi is very good, shower strong. Bathroom doesnt have a window but has a very efficient ventilator. We didnt cook, but the kitchen had a lot of equipment, you mightvjust need to bring your salt, oil etc. We didnt have to use the AC but I can imagine that it is a great thing to have on hot summer days. The street is reasonably calm, no problems to sleep at night. We didnt have to communicate too much, but Marius sent us all info needed upfront and was available in case of questions. Would for sure like to come back if we come to Vienna again