@Genia5
@Emiel1 is correct. There is a separate long-term cancellation policy which applies to ALL stays of 28 days or more, which overrides any cancellation policy you have set for the rest of your stays, whether that's Strict, Moderate, Flexible, whatever.
I personally prefer long term stays and have moved from doing a combination of short and long to pretty much just long term. It works for me. Occasionally there are problems but, in most cases, guests have been great.
There are two ways to ensure it almost always goes smoothly:
1. VET, VET, VET. Don't be afraid to ask questions, and lots of them, until you are 100% satisfied that the guest is a good fit. Don't be afraid to turn them away if there are red flags.
2. Make sure that the guest confirms in writing on the Airbnb messaging system that they have read, fully understand and agree to the full listing/house rules (I include a question in there that they need to answer so I know they have read the full version).
3. Make sure you understand tenants' rights/laws regarding rentals in your area so that you don't get caught out by squatters etc.
4. With long term guests, always check them in personally (or have a trusted and well trained person to do it for you if you can't) and follow up the next day asking if all is well or if there is anything else they need.
5. Keep anything important on the Airbnb messaging system. If you have an off-site conversation or exchange with the guest, follow it up with a message via Airbnb to confirm what you discussed.