San Luis Obispo, CA is the same small airport found in a hundred cities across the U.S.: Mosinee, WI, Minot, ND, Duluth and a hundred more. People are friendly, there is A baggage claim, no numbers and you can grab your bags as you talk to the rental car agent. That said do get a stall number for your rental car as we did. Walking around the parking lot listening for a horn as some lady after me did is NOT a good way to start a day! The airport is clean, good tech access and comfortable.
BTW the food below is what we got for paying $30 more and flying 1st class.. we HIGHLY recommend it!