Oh Gut, that sounds absolutely awful! How long is your commitment to have him there? What kind of repurcussions could there be in order for him to have to behave better?
If you can figure out what leverage you have then I would sit him down and have a chat with him. When I lived with housemates we'd have to do that every now and then. With all the reasonable, decent people the chats went very well.
You can keep it calm and mellow by presenting it to him as though you're having some problems with the arrangement and you need his cooperation to make things work better for everyone, blah, blah, blah.
That takes the pressure off him because you're telling him (outwardly) that you're having the problem. Skip over the "blame" part where you'd tell him all that he's doing wrong and jump directly to the "here's what I need from you" part, where you tell him what will work.
That way you avoid getting him all defensive because you don't focus on the negative stuff. Dump that on us.
Instead, just tell him what you need from him and figure out how you'll deal with things if he doesn't tow his line. Then stick to that if you have to.
Okay, that's it from me. I almost never give advice but this just reminded me a lot of housemates that we had to deal with, and I wanted to share what used to work. When it didn't work, however, we booted the housemate out on his or her butt. I hope that is an option for you, if necessary.