This is one of those places where you get closer to heaven when you least expect it. The setting is authentic, a true mansion owned by an old Mardin family. The proprietor, Ebru, has reluctantly got into the business when she failed to find a good place to eat in Mardin while acting as a tour guide to Germans. A Mardin native living in Istanbul, she sought the help of relatives (mostly women) to prepare original dishes of the region. Initially served at the relatives' houses, the food became famous enough to encourage Ebru to settle in Mardin and open Cercis Murat as a restaurant.
Firstly, you don't ask for the menu at Cercis. The set menu is an ample and delicious pick. It offers genuine mezes at small portions to sample. The stuffed rib, made from lamb and rice, is heavenly. All dishes are fresh, hard to find anywhere else and hard to prepare. Yet they are not too unconventional or unusual to be of worry to a Wasterner.
The taste of the food is complemented by a frendly staff, a kind and warm hostess (Ebru) and local music that can be a bit loud to the outsider (that's how music is made in the region).
I recommend this place to anyone that is ready to experience something special. To fill your stomach, you can find cheap and touristy stuff on the same (and only) avenue.