We enjoyed our stay at Christoph and Laman's place. There was a construction going on in the building but we were forewarned (and had to leave early any way) so we weren't very bothered by that. Perfect place for a couple!
The kitchen looked like it was mostly stocked with what had been left by other travellers, when we got there on a Sunday the coffee had run out. Not a big deal but you might want to keep in mind that in Vienna all shops are basically closed all Sunday if you arrive on that day and there is anything you can't live without.