Hi @Alex1046
Welcome to the community 😊
Airbnb is not recommended the host charge an extra fee outside the platform.
Check-in early fee or either check out late fee is not advisable.
The host can charge an extra fee related to the reservation by the Resolution Center.
You can open it by going to www.airbnb.com/resolutions and there you will see how to step by step.
However, the guest can decline the request.
Therefore, the host needs to communicate with the guest before sending the request.
Acknowledge the guest in advance is much appreciated.
What is a resolution centre?
https://www.airbnb.com/help/article/767/what-is-the-resolution-center
Happy Hosting! ✌️