We have had short term exchange students several times over the years.
From this point on, I'm going to be non-PC, close yer eyes if'n ye can't take it.
I recommend you not take a middle eastern student. Very often they come from very-very wealthy families and are not accustomed to doing anything for themselves. And, I do mean "anything", like getting a glass of water or making their bed. The woman of the host family is expected to do all that for them. Never have I seen one of these situations work out.
Any Germans here? I'm about to offend you, sorry.
Germans do not have the same attitude about nudity as Americans. They just don't worry about it. We had a German girl once who thought nothing of running around the house in her underwear or naked. Of course, I had mixed reactions to that but it was not a good situation.
What/whoever you get, I'm sure it will be an interesting and learning experience for all of you.
"Folks is funny critters."
Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire