How bookings work — Rates, minimum stays and check-in times
Price is a number on the unit — the cottage, not a service — because in this mode the unit is the thing being bought. The page quotes rate × nights. Leave it unset and the page quotes nothing at all, which is right for enquire-only and much better than a confident £0 on a holiday let.
Only a real number field can hold it. A Lookup would re-read its source every time the page rendered, so raising your rate would silently re-price stays that were already taken and paid for.
Minimum stay is the setting most hosts reach for first — it is what stops a single night wrecking a weekend. A night that cannot fit your minimum is not offered as an arrival at all, though it is still sellable as part of a longer stay arriving earlier. Check-in and check-out times are printed on the page, the confirmation and the calendar invite; they change nothing about availability, because the whole arrival day and the whole departure day belong to that booking either way.