Our expert says:
He may need help, he may even deserve help --- but why should you be the person to supply it, by sacrificing your comfort and privacy ? Does he truly have no alternatives ? Do you know him well enough to be CERTAIN that he will not stay indefinitely or cause other problems ? You were rash in offering before you had thought this through. Learn the rule NEVER offer anything while assuming the other person won't accept --- only offer if you would be happy for them to accept.
At 70 + he may be harmless. Talk calmly and tactfully with him about how you hesitate due to not really knowing him, and valuing your privacy, and explore what plans he is making to move on from here. If this is time-limited, to a month or two, it may be more tolerable than if it is indefinite
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