The apartement is huge, clean, and cozy and nearby to Wien Hbf (very good location). Even with with big suitcase is not problem to go on foot. During check-in there is only one key in the key box, which must be returned immediately after check-in. Your own keys are ready in your room. The only problem is that if you run into forgetful flatmates (as the apartment is shared) and they forget to return the keys. This unfortunately happened to us the night before our flight . We waited for over an hour before other guests came and unlocked the door for us. However, the owner is planning to change this system, and in the future check-in should be secured against such occurrences. Overall, I would totally recommend a stay here - the apartment is really beautiful and there is everything you need.