My friend and I visited Vienna for the first time before new years'. Although Rupert was away during the duration of our stay, he made arrangements for late check in. His friend waited for us for hours (while we somehow were trying to figure out our way after midnight in Vienna - he gave accurate directions, just we got lost while trying to find our way).
His flat is very cozy and clean (as in the picture). He left us Mozart chocolates to start our Vienna experience :). Since the flat is close to Schonbrunn palace, it's a good location to start one's discovery of Vienna!
Rupert was very prompt in his responses to queries and is a Great host! Highly recommended for those visiting Vienna.