One more tip before I leave off all this fast typing, I highly recommend a document, with copies for you, for them, for the file cabinet -- and a big chart of all this on your dining room wall -- of your explicit rights and responsibilities as owners, and the rights and responsibilities you don't have, and the other party's (tenants? renters? ongoing guests?) explicit rights and responsibilities and the ones they don't have. So that your arrangement is crystal, crystal clear. So that neither you nor they can ever say, "But you promised we could . .. !" "But you implied that you would . . . !" Because you agreed on these things in advance (including how you could change the agreement by mutual agreement) and were crystal clear and up front about it.
Any sufficiently advanced technology will be used as a cat toy. And this tiny ad contains a very small cat:
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