The apartment is on Jaegerstr. 12--the description on AirBnB says the apartment number is 10 an apparent error. Fortunately this was our second stay so we knew what the real entrance looked like. I wish that we had clarified the entrance code before we arrived but eventually we reached the owners and were able to get in without difficulty. The apartment is wonderful--full of light, spacious, quiet and clean. Even the entrance to the building and staircase leading to the apartment are beautiful. We highly recommend it, and will try to book it again for our next trip to Vienna.