Pedros flat has everything one could wish for, really well furnished, it is situated on the ground floor in a darkish backyard, totally quiet. Very close to the UBahn and less than 10 minutes to the tram. Several small restaurants and bakeries close by. Felt safe to walk home at night. I missed a connection with the host - there was no welcome note with instruction etc. , he was not present, but he was reachable by phone and helped to solve the initial problems with the key box and the windows readily enough.
I would happily use the flat at another visit to Vienna.