notyor - Suggest you arrange for Aerocity to pick you up at the airport - the price difference between Aerocity and a taxi are almost negligable. That way - you don't have to worry about getting over-charged, etc. after a long flight nor having to speak Spanish unless you are comfortable with the language. (sorry - but I don't remember if you do/do not speak Spanish)
Cabs are very inexepensive in Spain - but after a long flight - hauling luggage, etc. Aerocity's service is a god-send.