Within the first few days of move in, discuss your expectations and concerns with your roommate. (ex. Visitors, shared spaces etc..)
Establish ground rules, such as how to deal with common areas, cleaning duties etc.
e.g. Some roommates share food, that should be discussed beforehand. Otherwise eat only what you have purchased.
This will ensure that you and your roommate are on the same page.
Be respectful of each other's space.
e.g. Do not sit on your roommate's bed without permission.
e.g. Use headphones at those times when listening to music/watching videos.
Be respectful of your roommate's/housemate's schedule.
e.g. Be quiet when he or she is resting.
Be friendly, be aware and respect the fact that everyone has days/times when they do not want to talk.
Respect and communication are the fundamental principles of a successful housemate/roommate relationship. A situation where member each take responsibility for their own possessions, and daily living helps increase respect between suitemates.
Only handle your roommate's property with their permission.
Monitor your guests. Make sure that your guest respects your roommates' side of the room whether they are present or not.
Social media should not be used to vent about a roommate issue. Communicate how you are feeling. Your building RA's and RLC's can help mediate.