I am currently in the same position, only I have lived in SD before while I attended Law School at California Western School of Law. I am tentatively pursuing housing through my recruiter and at the same time searching for housing on craigslist via the room shares and making sure to check the furnished box. I am also using AirBnB to look for potential room rentals that way. AirBnB is more expensive but the site is geared toward short term furnished rentals and there is a lot of them, many near the beach. PB is about an hour commute with traffic to Palomar Medical Center in San Marcos/Escondido area so I would stay a little north. The craigslist rentals are priced lower but many of those people just want a roommate for long term lease situations. If you send out a lot of emails and text messages and phone calls to the craigslist ads (I have sent out like 30 and I have about 4 leads) you should be okay. I also got a tip from a potential landlord that a lot of the ads on craigslist are also cross listed on AirBnB. He suggested scheduling to stay at an AirBnB location for a while and then communicating with the landlord to see if the rest of the visit could be negotiated privately. AirBnB takes some money off the top from both the renter and the landlord so it sounds like it could work. AirBnB sounds fun, staying at a different location after every few weeks would allow someone to see a lot of SD! Also, I have found that many of the listings on either website which are furnished are not occupied by the owners and you could get lucky and end of renting a room in a house where you have it to yourself for some of the time but at a fraction of the cost. So far the rentals I have focused on range from about $600 a month to $1100 a month. The cheaper rentals are farther from the beach and if you find really cheap rentals it is a scam and don't ever send money without making sure you are not getting ripped off. The more expensive rooms are really nice and closer to the beach.