Very good.

It was very easy to find the car rental and return location. Just follow the metro loop line to the blue rental car company at San Francisco airport, and return the car by following the navigation. No additional fee for returning the car in a different location. No additional fee for returning the car in a different location. No additional fee for returning the car in a different location. Driving along Highway 1 was incredibly beautiful.

Counter staff very friendly

Although the queue time was long, the service was excellent. When I lost the key, the staff stayed with me the whole time, providing assistance and transportation. They had someone tow the car back, but I later found the key, so they didn't charge a towing fee. The next day, they refunded my deposit in full. Budget's service in San Francisco is much better than in Los Angeles.

Pretty good overall, just got added roadside assistance insurance when picking up the car, but returning the car was easy.