I cannot compare it to Greek restaurant in Greece and it would be unfair to do so, but I believe taste-wise it is the best Greek restaurant in Frankfurt.
The atmosphere is also good, it is comfortable and cosy, with not too eccentric decoration.
The waiters were also nice and polite, just that one plate came a bit late, but it was a mistake that can happen anywhere.
I would highly recommend it. We had different kinds of meat and also starters. All worth trying!