Great apartment, comfortable, spacious and very well equipped. Haven't noticed this when booking but there was even a tumble dryer.
Very close to the metro station and Billa supermarket. Air conditioning was installed in both bedrooms, but even though we were there in July and the weather was warm and sunny (it wasn't hot) we didn't have to use it.
Great view on Prater, especially by night. You can even hear people "enjoying" the Prater's attractions, but it's not disturbing.
Highly recommend!
One small comment in terms y of the beds. There is one double bed and two single beds in two bedrooms on the floor and a sofa in the living room. The beds were comfortable, but the sofa not so much. I know it's just a sofa, but I've seen more comfortable ones (I've seen worse too, to be honest). I wouldn't like to sleep on it, especially for several nights. My wife said it was "ok". The kids enjoyed it. I'm not writing this to discourage anyone, because our overall experience with the apartment was great, but if you are a group of more than 4 people and all of you have back issues you may want to know it :)