I would like to express my thanks to National car rental in San Francisco. I came to SF four times during the last 3 months after our company HQ's relocated to the city. Twice, my company sent a car to pick me up at the airport and I later rented a vehicle at Union Square which is a hassle. Third time I booked a car at the apt - National was cheapest so I gave it a try as we don't have a preferred rent-a-car in our firm. I got a new car that was both very clean and technically in a very good state. This time I also rented from National and again - hardly any waiting, a free upgrade (well, I understand they just didn't have the category I ordered but it is still a plus) and the car had very low mileage. Very good experience!