The location is great, in a neighborhood but very close to transportation (the 49 tram is steps away) shopping, the Mueumsquartier, a market, Mariahilferstrasse, and good restaurants.
Gerhard was readily accessible for any questions or help. We had no problems. Ample hot water, sufficient kitchen, very comfortable bed and pillows... and so quiet at night! Perfect for sleeping. The radiant heat made the apartment feel extremely comfortable in the cool autumn. The washing machine and drying rack allowed us to bring fewer clothes and dry them while away for the day. Large closet area with iron made clothes access simple and convenient. The terrace was pretty. Ring away from the street means no traffic or city sounds.
Do not have any trepidation, just rent this place!