Beware of the petrol station nearest the airport used for filling up the car before returning it. You pay by machine - there are no staff whatsoever. The machine refused our two 20 Euro notes, and credit card, and, because of shortage of time, we ended up putting in a 50 euro note,(which was accepted) for only 23 Euro worth of petrol. No change is given. Keep lots of 10 Euro notes aside for this purpose to avoid losing a lot of money!