[V K Lee]

First considerations: Are these friends subject to seasickness?

If not, then would suggest watching several of the countless you tube videos which discuss the pros and cons of living on a boat. There is numerous video channels with living day to day on a boat on the seas as well as living on a river boat moored in a community.
Example: https://www.youtube.com/watch?v=hZ7NWDmzvG0

[Steve Van Doorn]

That sail boat is to small for two people to live on.
Great for over night sailing though.