Yesterday night, we booked a car from Hertz, just under £130 for 7 days. Hertz has a branch in Piraeus, which is convenient as we will be staying there.
We get the cheapest car, which is supposed to be a Hyndai small, manual car. It is just for two of us and won't go so far, so it should be ok.
I still have to make my luggage, but I don't think I will do it until tomorrow.
Now... I am going to watch CSI Miami and then go to bed.