Gerhard and Nicole's place is just awesome. Right in the middle of town, perhaps 5 mins walk to the U-Bahn at Volkstheater - it's also a quick walk to the MuseumQuartiel, a lovely place to spend whiling away the evening with a beer or 3.
The flat is perfect, everything you need, good wi-fi and spotlessly clean. It was 30 degrees most days we were there and the flat always felt cool and was a pleasure to come back to.
We didn't meet Gerhard or Nicole but they were available if we needed them, their friend Traute who checked us in was great and showed us all the ropes + made some recommendations when we arrived.
All in all a great trip, a great flat and a great city.
Bis nächstes mal Wien!