We had no complete key set for the front door. This way we couldn't go out the first night, because we wouldn't had been able to enter the building if another tenant would have locked the door. This way alway one person needed to stay in the apartment.
No quick fix of the situation. This is a professional managed AirBnB where you would expect a quick fix or no error in the first place.
Besides this issue, the flat was as described in a top location and a fair deal for the price.