I enjoy living with my friends. It's nice to have someone around to hang out with too. With the exceptions of kitchen appliances, furnture, tv, and stereo he really shouldn't be messing with any other stuff. There's no point in being neurotic about a tv or stereo, they're there to be used. As long as you two have similsr personalities (IE, is he a total dick too? ) you'll be fine.
Plus, if it doesn't work, it's your house with your stuff in it. Kick him to the curb.
I'd say give it a try.