We arrived very early in the morning around 9am, but the hostess still allowed us to drop off our bags and pick up the keys from the cleaning lady. The apartment was beautiful! High, vaulted ceilings, amazing design. It was only a five minute walk from the tram that runs around the inner circle of Vienna and there's a supermarket right on the corner

My only minor issue is that the apartment is at street level. So cars and people going by at night can be noisy and you have to sleep with the windows closed. Otherwise, I highly recommend it!