It is required that all unmarried BYU students live in BYU-approved housing and abide by University housing rules (although there are exceptions granted for those living with family, students over 25, and graduate students). This means that your choices for housing are limited to what BYU deems okay. Not to worry, though—most of the housing in Provo is BYU-approved. Off-campus housing is known for being very social and usually a lot of fun. You get what you pay for; if you want cheap rent, don’t expect to live in a palace. Because BYU students have to live in approved housing, landlords tend to raise the rent each year, knowing that the housing will be filled.
Be sure to research a place thoroughly before you move in. Talk to people that have lived there: do they like it? Is the management good? How is maintenance done? There is also an Off-Campus Housing Office that can tell you where housing is available. They also can step in to help resolve disputes, should any arise. The housing varies so widely that it is difficult to put just one grade on it. Some is so trashy it seems that they should pay you to live there, and some is not bad at all. This is just one area where you definitely want to do your homework before making any decisions.