When booking with Rental Cars on line there is no mention of an airport charge. The quotation actually said, "This is what you will pay US$154.00" (for 12 days)
At Hertz check-in in Barcelona I was informed that there would be a 40 Euro airport charge in addition to my rental charge. She pointed out that in my rental voucher it does say, in very small print, that there may be an airport charge. At this point the booking is already confirmed and no one would guess there would be any change from the advertized price. The agent said that she had worked all over the world and there was always an airport charge. Furthermore, the agent was very rude: "you have rented the smallest car possible, she said, are you sure?" Then, she didn't just ask me for my credit card and passport. She said, "no credit card, no car." I don't know if this was her sense of humor. Finally, I gave the car back a week earlier but there was no refund possible from RentalCars. Never had this experience with renting cars. I booked directly with Avis for a larger car in Bilbao. Got a price similar to Rentalcar's price on their smaller car. No airport charge. Great service. What is the point of going through a broker for no price advantage, being stuck in a contract, and having to pay unexpected extra charges?