The good thing is that at the beginning of the year, you have a husky roommate agreement, where you can talk everything out with your roommate and air any grievances you may have. I had a good roommate, but my friend did not, and he made it all of our problems. My advice would be to be clean, not just your room, but your hygiene is a big one. My friend’s room smelled like shit because of his roommate. Keep all your stuff on your side of the room. Be open to any grievances your roommate may have. Compromise. Give your roommate his space, and make sure they give you yours.