Thanks for the suggestion. Padmapper indeed is pretty great, but the one problem I'm having is that most of the listings are for 12 month leases (or similar). Is there anyway to narrow the results to just sublets or listings just over the summer?

click on 'filter listings' in the bottom left. uncheck "Show Full Leases" and all you are left with is sublets.

I'm looking to stay in Berkeley from mid May to August so I've been browsing padmapper and this made the searches much more efficient.

Find a place you want to live and call the complex to see if they have shorter-term leases available.