When looking for rentals, your best bet is Craigslist. 85% to 95% of all rentals leased in San Diego County are fulfilled using Craigslist. It is used by owners, property management companies and agents.
The easiest way to search is put a zip code in the search box and then enter the rest of your parameters. Check often and call right away as most rentals move quickly!
Lastly, beware of rental scam listings. Make sure you talk to the person managing the property and meet them to see it. Get an application to fill out and read over the lease agreement.
Best of luck to you,
Mark & Kari Shea
Shea Real Estate
Serving Greater San Diego