I agree with the OP. Obviously it’s their house, they have that right, blah blah blah, but it’s clear he was only trying to find his room and if it had been open he would have glanced in, noticed it was the wrong room, and kept looking. And I just think it’s a little bizarre. Like, what are they hiding? Why are they so suspicious?”
JF, do you not think they showed him where he would be staying? No one lets someone into their home without showing them/indicating by note/or having someone else show them where they will be sleeping. I even set out hot cups, bottled water, instant coffee or tea, and my husband who gets up for the Hashkama minyan, puts out milk, sweetener, paper goods and plastic ware, so they have what they need for a hot drink and don’t need to look for it. I leave some cookies or danish, in case someone needs to eat SOMETHING before they go to Shul, as is sometimes the case. And that is WHEN I am at home, in case they get up before I do, so they don’t have to look for anything. I would not let anyone stay by me, if I were not in my house, for exactly the reason that our OP demonstrated.