@Noel809
There are two options for long term cancellation policies (strict and flexible), but the differences seem only to apply to cancellations before the stay begins. Once a stay has started, I believe both policies are the same.
Here you can find the details of the policy: https://www.airbnb.co.uk/help/article/1361/cancellations-of-longer-stays
Note:
"
- If you cancel after the trip has started, the following 30 nights of the reservation are non-refundable"
So, that means the guest should be charged for the nights they already stayed PLUS the 30 nights following the cancellation. Many guests are not going to be happy about that, but it's the policy they signed up to, so you are within your rights to stick to this.
I would normally offer to refund the guest an additional amount if I can rebook some of the nights, but make sure to explain to them that they need to cancel first for those dates to open up on the calendar and that there is no guarantee of me getting last minute bookings. It's up to you if you want to offer this or not.
However, be aware that if the guest sends a date alteration request to shorten the stay, rather than a cancellation, and they are still 30 nights or more of the reservation left, Airbnb might automatically allow it, which means you'll be left out of pocket.
If there are less than 30 nights before the check out when the guest requests to shortened the stay, then you can approve it or not.
Your situation is a bit complicated because it's half way through a two month stay. I would really need to know the check in and out dates to be able to tell whether you will be forced to refund or not.