We stayed in Sarah and Thomas’ for 3 nights while in Vienna. We didn’t meet them personally but the instructions to get into the flat were very easy to follow and we had absolutely not issue. The apartment itself is big and bright. Probably one of the nicest we’ve rented so far. There is a bit of construction going on at the moment, but it did not affect our stay in any way. We would recommend without hesitation if you are visiting Vienna.