I always call Airbnb first. We pay them for their management services and I am EXTREMELY nice to them. They have never disagreed with me. Make sure you have all your facts straight. I would call in front of guest, preferably on speaker and let guest know call is being recorded. Present facts. Make sure you have it written in your house rules UP FRONT, the penalty for late check out and the exceptions, ie impassable roads due to ice, first I’ll and how long you will let them stay without penalty-I give them 1 hour. If they stay to the point where I cannot turn the space over and it impacts the next guest, then they are charged another day plus a penalty. Airbnb has always backed me up and THEY collect the funds.