maid service for room and board sounds good. household chores take up so much time. cleaning the kitchen and bathroom is time consuming. if you add childcare to that list when the landlord is away, you may get some offers that are legitimate. this is called a live-in caretaker. alternately you could HHA (home health aide) work that is also live-in with the caveat that hubbie lives there too. on top of living in though, you will get PAID!
any mature male should understand that trade of sexual services for something else other than outright cash for that meeting only will lead to trouble due to greater and greater demands wanting to be met in the future as the body adapts to sexual stimuli and desires more and more perversion. this is why porn works so well. we can't just watch the same clip again and again as the body adapts to sexual titillation so we want new categories or scenes so the work for the girls keeps coming even with millions of videos available. the same would happen irl. and then you'd be kicked out. i didn't even mention risk of STDs from the guy's side as who knows what he is doing on the side besides what he does with you.