We were thoroughly happy with our stay at Gebhard's. The location was excellent as I knew it would be, however, with the bonus of being nice and quiet and close to a lovely courtyard area, yet just being off the main shopping district, MariahilferstraBe and within 10 mins walk of the Museum Quarter and central Vienna.
It was extremely clean and contained everything we needed and Gebhard was a wonderful host, for whom, I know if we'd had any problems at all would've been there. It met my expectations and more. I would whole heartedly recommend both Gebhard as a host and his wonderfully well kept spacious modern apartment.