Cal Rentals has a lot of great articles about finding housing in Berkeley. Here are a few of the best ones:
Great housing guide from the graduate assembly: https://ga.berkeley.edu/resources/housing-guide/
Follow freshmen looking for housing:
Emergency housing resources from the Basic Needs Center:
Places to find housing
Know your rights! The city of Berkeley offers free seminars to prospective tenants about eviction laws, rent control, repair issues, security deposits, and more!