The short answer is no...but there are some good resources for looking. Start by having the agent you choose (always your first and most important search because that is the start of a successful house hunt in the Bay area) put the word out to colleques and friends. Most of the best rentals, including short term, never really hit the market. If you can do a studio type set up, the easiest is the Extended Stay hotels. It's basically a room and kitchenette, but you only have to make a one month commitment to get the best rate. The rooms are clean and the facility reasonably well maintained with a pool and gym.
Also, in estimating your search time, you should know that we rarely see escrows longer than 30 days in Berkeley. Escrow is the period between when your offer is accepted, and when you get the keys. You will spend longer looking for the house, more than likely, and you should expect to write offers on more than one home, unless you get very lucky. Many homes here still get multiple offers, so again, you want to find an agent you feel you can work closely with. Good luck with your search!