I am thinking about putting an appartment up^for rental on AirBnB, however I would like to restrict the access to people that are able to fetch the keys from Belgium (the appartment is in Spain) since I have no option to deliver the key abroad.
Hence, I would like to indicate in my add: "Keys available exclusively from Belgium".
You can do this if you want to massively restrict those who want to stay with you @Thomas1298
Why don't you do what everyone else does who hosts remotely and have a lock box/used an automated lock system/have a co-host who can manage your place on the ground/let people in.