@Jo620 I see you have a private room home-share listing, as I do. So I'd say one thing to keep in mind is to not be reticent about speaking up about anything he does that isn't fitting, as soon as it comes up. If he uses the kitchen and doesn't clean up adequately after himself, for instance. Or leaves his stuff laying around in common areas or is noisy early or late when you may be sleeping.
When you home-share, it's important to have a good, easy-going line of communication with the guest. I've read so many posts over time from home-share hosts who allow behavior which disturbs them go on, because they are uncomfortable about approaching the guest about it and end up feeling invaded in their own home. The longer you bite your tongue and stew over something, the more you resent the guest in your home and the bigger deal it becomes.
One tactic to make it not feel like you are nit-picking the guest is to just drop it casually into a normal conversation. "We're going out to our friends' place for dinner tonight, so you'll have the place to yourself. Oh, by the way, could you please make sure to wipe down the countertop whenever you're finished in the kitchen- we get these little sugar ants moving in if the counter is left with any crumbs and stuff on it. Hey, did you have time to check out that nice little cafe I told you about?"