Stayed in this apt for 6 nights. A very nice apt suitable for 4 persons ( more would be probably a crowd ). If you are traveling by car parking space around the building is free of charge but you need to find an empty spot. Location is not the center of the city off course but it is quite ok. Approx 10 minutes walk from last (or first) u-bahn station. From there you have 4 stations to Stephansplaz. Tram station is also around the corner. We have not met Ellena personally but there was no need actually because everything was in order and the key handover was done by Ellenas friend in front of the apt on agreed time. It was very easy to agree on everything with Ellena. For us ( family with 2 kids ) everything was great and in case we come back to Vienna, Ellanas apt is definitely in our address book.