Luckily I have legal insurance and called them for helping me with a watertight contract and there is a work around. You advise the 2 rooms as a commune. Also in the contract is that their rooms will be cleaned once a week by a domestic. That way she can report to me what's happening. LegalX can also do a financial and criminal record check. The person that rents the room will sign the contract at their offices. Lawyer told me that if people must come to their office to sign the contract, ask for ID, references etc. the baddies won't sign. Also advised me to make a video of everything in the house, walls to floor, furniture etc. They'll have the video and give whoever rents the room a copy of it. Lots more advice but that sums it up.