@Jo-Ellen0
Here's how you can play with your basic settings to charge extra in exceptional cases like upping the usual guest count, changing minimum/maximum stays, additional agreed upon fee charges" etc.:
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The Airbnb system is quite good for what it is but has limitations. However, fine-tuning them to one's own needs requires knowledge of the site settings and some creativity.
Go to your maximum no. of guests setting, then switch it to 3. After that go to the reservation and make a change (making changes is possible until the guests leave or the end of that day):
The algorithms now let you type in 3 guests. The system will automatically upload the extra guest fee.
If the 3rd person only stays for part of the original booking, then you'll have to calculate all fees in total and overwrite the automatic calculation.
(And add this calculation in a message to the guest, so that it's clear what has been arranged.)
You send off this change offer, and your guest will have to confirm it.
After sending the change quickly go back and reverse the maximum no. of guests back to 2.
Do not forget, since you'll otherwise end up having the same problem with bookings for too many guests as @Lucinda Beaumont did!
Playing with the settings like this lets you individually adapt bookings for individual needs like extra days:
For ex. my set maximum no. of days/nights for a booking is 6. A guest said that she would need one day longer before flying back, and if I was open to that. I had already gotten a vey good feeling from her inquiry, the day she needed was still available, so no problem.
I switched my max nights from 6 to 7;
made a change in the reservation from the booked 6 to 7 and sent it.
Then switched the max back from 7 to 6.
Or if you are okay with a guest coming for one stay with an absent day or so inbetween that you don't want to charge.
You can have the booking for ex. Aug 2 till Aug 15 , but allow the guest to leave everything for 2 days and come back (without extra cleaning) for the rest of his stay.
In the original booking the system of course calculates 13 nights, while in the calculation you can overwrite the automatic price to reflect all fees for only 11 nights. In your separate message to guest you explain exactly what this entails, so that it can't back-fire on you if they decide to stay the 2 days after all. (Then you simply change the reservation again).
Easy and simple!