Dear @Federico848 🌿
If you have found a place on Facebook marketplace and they write they do business with contracts etc. through Airbnb you should be extremely careful. It is very much the way scammers scam - they make it look like they rent through Airbnb and then ask you to wire /transfer money. That is not how Airbnb works. You are automatically entering a contract when you book on the Airbnb platform and you can of course then afterwards make a contract with your host.
I just wanted to mention it -because your question made me think red flags and scammers. Maybe you can tell us some more?
Best, Sandra