When you decide to move in with roommates you are adopting their habits, guest lists, dramas, perfume/cologne choices, and everything in between. By sharing space you are bound to run into a spritz of scent which flares up your allergies, or hear a few powwows you aren’t invited to in your own living room with guests you don’t want there.
To keep foot traffic through the apartment at a level you are comfortable with, take a minute to create a Roommate Agreement. This will help you call ahead first to prep the other roommates, or keep the late night parties to non-work nights. If spontaneity is their thing, or your thing, keep the noise down and agree on boundaries as to where guests can and cannot venture in the apartment.
Write it out.