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Some tips here:

Roommate Agreements
Here are a few ideas on how to keep roommate frustrations to a minimum. Consider the following items when forming an agreement with your new roommate (or friend-roommate!).

Space issues – What areas are to be shared in the apartment and what areas are to be private (bedroom, bathroom, etc.).
Personal Items – How food and other items are to be shared such as shampoos, towels, medicines. Set standards of usage. Label items with your name if necessary to set boundaries and ease confusion.
Cleanliness – Hopefully you are both on the same page when it comes to keeping the apartment clean and are both willing to contribute. Create a cleaning schedule with who does what each week.
Noise – Agree on noise levels during certain times of day, such as music playing, instrument playing, or television watching.
Expenses – Perhaps the most important consideration. Money is the toughest issue between people but has to be dealt with respectfully. Agree to who pays for what and the splitting of rent and expenses ahead of time to save a lot of future disagreements.
Storage – The storage space in you apartment can be limited. Examine the areas together and divide as evenly as possible. Areas to consider are: kitchen cabinet shelves, refrigerator shelves or drawers, bathroom storage spaces, and closets.
Overnight Guests and Parties – Set limits or notice times (like a day or two beforehand) that need to be given to your roommate so that no surprises or problems arise that could ruin an otherwise fun occasion.

from Aprtmintsilike.com