We loved our stay. We were worried about the lack of A/C since it was 95 out when we stayed, but the neighboring buildings blocked a lot of the direct sunlight and the apartment stayed cool. There were multiple fans in the apartment, which helped circulate air. You can open the windows wide at night, but there are no screens and the windows aren't super high off the ground, so watch your kids if they are tall enough to climb on the windowsill and too young to know not to fall out. Otherwise, just tip the windows to vent for safety.
There are a lot of places you can walk to from here. Prater is a bit far (nearly a half-hour walk) and we tried the local transit system which was a hot mess of directions (walk, take metro, walk, take tram, walk, take train, walk, take bus...it took several modes of transportation and longer by far than it would have taken to just walk there). If you're doing Prater and you have a car, DRIVE. There's a parking garage at Prater and it's so, so convenient.
Back to the apartment. It had a strange setup with a tub, shower, and sink in one large bathroom and a sink and toilet in a water closet off the hallway. I've never seen a setup like that, but I like it. If someone's showering and someone else has to use the toilet, you don't have to wait. The main living area was large and the beds were decent (a touch firm for my tastes, but still reasonable). There were two double beds with the headboards lined up so it almost looks like a single bed with a mirror behind it, but my 4 kids enjoyed sharing a room together and I was happy nobody was sleeping in the living room, which made the space more usable. My only complaint is the location of the dining table in relation to outlest. We tried plugging in our computers and the one outlet was a bit awkwardly placed. I used that one while my husband camped on the couch near another outlet.