"I am a male in my mid 60's and I am looking for a room mate. Times are tight and I need some extra money. I am willing to rent out my bathroom in my 1 bedroom East Village home. My bathroom is large. You can easily put a twin air mattress in there. I only ask that when I need to use the bathroom, you or your air mattress are not in it. I do ask that when you are in the apartment, you confine yourself to the bathroom. I do not feel comfortable with a stranger walking around my living room. This might change as I get to know you better. You may have guests over as long as they are cnfined [sic] to the bathroom as well. This might seem a bit odd but please remember the rent is $400 and the bathroom is large."
We think it would be fair for you to ask him to keep a jar by his bed. Don't dudes that age pee a lot at night? [Craigslist]