The apartment is very nice, full of light, comfortable and very clean. The location is very good. Railway station Wien Meidling is about 2 minutes walking from the apartment. Also there is bus station from what you can arrive to the Opera. And the underground station Meidling is about 4 minutes. So you can go anywhere you want :)
Rainer is very careful host. There was no problem to get the keys. We were flying away in the evening, and Rainer allowed us to leave the luggage in the apartment untill our departure.