Hello Tanya,
@RickyRO I have very recently been told that car hire works out extremely expansive now,friends from Denmark lost nearly two thousand a year ago for a short hire so be careful.I would say dont pick up from the airport,use public transport down as far as you can on the Pellopennese and hire a car there locally,then on your return leave it there and come back on public transport again,I think trains dont go down there that way but the public buses are like very smart comfy coaches and reasonable price,you put your stuff underneath
@dowlingtk you could look Tolo area.It is near Nafplio.Tolo is to the coast