I've lived in Greece so am very picky when it comes to Greek food in the US. Most places I've tried have Americanized their menu. Not necessarily a bad thing, but if you're looking for genuine Greek food, it is.
Athena is the real deal. I measure Greek restaurants by their salad. A true Greek salad (horiatiki salata) does not have lettuce. Lettuce is added to appease Americans who associate a "salad" with lettuce. Athena has two salads. One called a Greek Salad which has lettuce (presumably to appease Americans who have come to expect it) and their Greek Village salad which is made EXACTLY like an authentic Greek salad. I was pleasantly surprised. It was outstanding.
Their Gyro is perfect and their Tzatziki is thick like traditionally found in Greece. Their saganaki is made with kefalograviera cheese and finished flambe tableside. Fantastic.
As far as Greek restaurants go, I cannot recommend Athena more.