I know that there were a few agents on nextdoor that were placing furnished rentals.
But it just seemed like the furnished rentals were a lot more expensive than if you bought some furniture here and even if you decide not to stay, toss the furniture, especially if you are going to be staying for an entire year.
I wouldn’t use craiglist. It’s scammy these days. I’d sign up for Zillow which gives you access to two other websites.
As far a good elementary school. There’s many of them.
Carmel Valley district (all) , La Jolla, Bird Rock, Rancho Bernardo (Chapperal), 4S ranch. Others can chime in as well as I’m sure there’s some good ones in Carlsbad, Poway, and other places too.
Cooling costs go way down the closer you are to the ocean. I don’t run my AC most of the time.
As far as looking for a job, depending on what you do, you might have better opportunity finding a job in the Bay Area and working remotely from san diego.