Proroch,
Try to be smart !
ATO who provide cheap flight training, are the ones who feed you peanuts, and your gonna act like a monkey !
Ionian Aviation is one of those so called ATO, less expensive training organization.
Stay away from Ionian Aviation by just 100 feet, and go to Global Aviation, which is next door, at Megara Airport.
This I know from experience , I have worked as Chief Pilot for Ionian Aviation
Egnatia is also top of the bill in Greece, I can recommend for sure.
Whatever you decide, before you put any money down, go and visit the place, and talk to so many people as you can.
Don`t do anything stupid, unless your father is a millionaire, then do whatever makes you happy !
Good luck.