What an interesting ad. Is he going somewhere anyway? I've seen ads in the past of people interested in going sort of like a caretaker if their part of the cruise is paid for, so there's hope.
I might have considered it, but just committed to a room share in early April. Ironically I'm a nurse (working though should be retired) in geriatrics in a nursing home.
Where does he wish to go? What cruiseline is preferable? When?
These might provide some insight to potential responders.