@Mattias29 I don't understand your rule: "Self-home where the cottage is left in the condition it is on arrival. Cleaning is the responsibility of the tenant."
Does this mean you expect your guests to wash all the towels and linens, sanitize all surfaces, clean floors, remake the beds, and prepare the cottage for the next guests exactly as it was prepared for them? Because if that's not what you mean, you should be much more specific about which cleaning tasks you require guests to complete before the 11 AM checkout on their departure date.
And if it is what you mean, I'm a bit disturbed, because it sounds like the next incoming guests are always at the mercy of the previous guest's cleaning skills, which might be sorely lacking.