Thou Shalt Talk Openly About Problems
Grossed out by your roommate's mysterious Tupperware that's been lurking in the fridge for weeks? Mention it! But in a nice way (e.g., not with a passive-aggressive Post-it note taped to the fridge). There are bound to be some conflicts that arise when sharing a living space with one or more people, so communication is the key to creating a happy, tension-free environment for everyone.