Dear Frederic i see you´ve never been in the Greek Embassy in Warsaw :D
I would avoid at all cost using these people. While the vice consul is a very nice and kind gentleman, the Greek consul is completely the opposite. I am an EU citizen and tried to obtain a visa there for my spoouse. I even have family in Greece. I was treated like dirt and border line insulted. Not only it has ruined my vacation plans but cost me cancellation fees. The Greek economy is worthless and insolvent. Makes you wonder why, but when you deal with people like these, then you begin to understand. They deserve what they get. You've been warned.