John C.
Yelp
This place was a delight. It is steps away from the Hagia Sophia and Blue Mosque, but has history of its own. We enjoyed a surprisingly good meal while relaxing on comfy stuffed chairs (think bean bag with a back) in front of the plate glass windows on a cold and rainy night -- delightful view, comfortable seating, beautiful atmosphere... Then, after stuffing ourselves silly and then enjoying a complimentary tea service to end the meal, we inquired about the famous excavations underneath the restaurant. Our server was delighted to take us on a personalized tour himself, since it was low season (mid-March) and only four or five of the tables were occupied.
Wow... I say wow. It's hard to believe that the owner of a restaurant on his own nickel has been able to excavate such an impressive piece of history... Turns out that they noticed an unusual hole in one of the walls and had to spend quite a while getting the government to allow him to dig through that wall (which had been stucco'd over) to discover several large chambers of the ~1700-year old "diplomatic wing" of the original Constantinian era palace. Still does it all on his own dime, while dealing with bureaucrats every step of the way.
Overall, well worth a visit - for the decor, the food (actual quality, not tourist quality), and for the brief history tour.