We were a group of six and loved the spacious and cool apartment (we were there during a heat wave). It is on a pretty quiet street out of the center surrounded by a number of good restaurants and several grocery stores. It is very close to mass transit so convenient for going to other areas..
The beds were comfortable and the kitchen fine for the basic use (we didn't try to cook there).
We didn't have great communication with the host but the place is comfortable and was a good base for our days exploring Vienna.