Rainer's description of the flat is accurate. Lovely old building. Yes there were a few stairs (wait for instructions about which side to come up!).

Rainer was helpful with information before the stay, and welcoming and helpful when I arrived. Nice guy. I had very little contact with him after I had arrived (I gather he normally has other house mates, but they were away while I was there). Other than when using the bathroom, it feels very much like you're in a separate apartment.

The apartment is in the heavily touristed part of town, so very well serviced and incredibly beautiful. Not the hippest part of town, but it is Vienna and the public transport is excellent, so nothing is very far away. Rainer's apartment is very well serviced with public transport.

I'd stay there again for sure, and recommend it.