@Lauren2938 indeed you should worry about the legal issues such as
1) Will you lose your FHL status by accepting this request
2) Will you lose your small business rates relief
3) Are you happy that the profits are no longer pensionable and you can't claim mortgage interest as an expense
4) Have you got an EPC for the property if the tenants will pay for utilities
5) If they are willing to pay a deposit have you researched the deposit protections needed for tenants
6) Are they willing to sign a normal rental contract
If you are truly a short term rental business I would stick to STR