We visited Ariston last month when on vacation in Frankfurt.
Never thought I would find good greek cuisine outside of Greece..to be honest we wouldn't even try if it weren' t for the great reviews we read that intrigued us.
This place represents what's good in Greek gastronomy...it combines modern gourmet cuisine with the wonderful greek gastronomic tradition. The only thing we regret is visiting this restaurant on the last night in Frankfurt!
Great enviroment, professional and friendly service, fantastic menu and reasonable prices. I had one of the best steaks of my life (and I am a really big fan of them!!) and my girlfriend had a fantastic version of the traditional 'Smyrneika soutzoukakia'....and on top of these the deserts...make sure you ask for the kantaifi with cream (don't remember how it was named on the menu).