ahhh Athens it brings back the memories* ;D
this was served up to me in Athens not far from the* Acropolis after which i gave up and just ordered Frappes sure they are made on instant but they are tasty and nice and refreshing on a hot day.
thats a great itinerary :) i always suggest trying to get off the tourist strips and look for a place full of local preferably with little or no english on the menu....
I always found you then get a more interesting experience. Start practicing a little Italian so you can order a few things. A bit of trying to speak the local language* goes a long way in a locals eyes* ;)*