No Translator, I wouldn't allow the plumber to move a wall picture. Because a plumber isn't a guest. A plumber is a plumber.

If I invited a 'guest' into my home, and that is the context being used above - we expats are here as 'guests' - then I would allow a guest to make themselves comfortable. That's pretty much the very definition of guest.

Translator, you aren't going to convince me (or possibly others) that you are right, and I am not going to convince you that I am right.

We'll have to agree to disagree.