Fiat Seicento

25 euros a day from kefalos tours 

It's a very small car, but there's plenty of space up front for two adults, although the rear seats are only really suitable for small children. Mine was nearly new, and it had electric windows and air-conditioning, although this wasn't as effective as some. The small size and willing engine makes it very easy to drive and it hardly seems to matter that the steering wheel is on the wrong side making a good choice if you're not confident about driving on the right.