Looking back on my college and young adult years, I'm surprised I found decent roommates at all. So many people I lived with would get a job offer in another state and just pack up and leave. Others would decide to move in with their girlfriends or move back home. I think renting a large house with three or more roommates is a huge risk for young adults with limited incomes.
One roommate can leave unexpectedly and the rent might still be affordable among the remaining three. However, if one more roommate decides to move out, then suddenly the arrangement is not so affordable. Finding suitable roommates to replace the ones who left can be a stressful situation. It pays to ask potential roommates about their ability to commit to a long-term rental agreement.