Originally Posted by remymartin

Consider yourself lucky, then! When I stayed here my "friendly" cab driver with a 15 year old E-Class Merc did the old bill scam - I handed him a 50€ and he did some fiddling with his hands, turned around and showed me I'd "given him" a 10€ instead of a 50€. I apologized, and then proceeeded to give him another 50€ bill and, instead of paying 40€, ended up paying 80€! Unfortunately, I figured out the scam only inside the hotel when I counted my bills.

My recommendation - use Uber in Athens whenever you can! Ubers are regular taxis in Athens, fwiw.