Not being funny, but heard so many bad reports about some the cheap hire cars from Autoreissen at the airport. Just last week a friend got one, seatbelt kept popping out, power steering wasn't working and passenger window would not go down. Probably a reason why they are so cheap. Plus if you have a problem they do not have offices in this area. Try a local Renta Car, who also do Airport drop offs and pick ups, then if you have a problem, they are right on your doorstep to sort it out.