An old friend (were out of touch for 16 years, shared accommodation in student days in London) who is a locum biomed scientist got an offer to work for 6 months in a hospital near to mine. She asked if there is a room she can stay in whilst working there. She did not say anything about paying for the room, but I don't want a lodger anyway, I just want peace and quiet with my dc and dh. They don't know her and I don't think they want a stranger in the house. What do I say to her? I don't think I want anyone who is not a family member with me for 6 months either.