Clinic is all right and clean, good location too, easy and cheap to reach from Sultanahmet - 20 min and about 200 turkish liras
My displeasure was with the fact that upon my arrival at the clinic for smile eye surgery, they asked me to pay 1800 dollars (the price the surgery) upfront without performing the consultation first. I had to insist to speak with the Doctor before my surgery and that I wouldn't pay just yet - they let me speak to the Doctor eventually, performed the consultation, and discovered, alas, that they couldn't do it because I had some other issues with my eyes. So in the end it didn't cost anything because I wasn't eligible for the surgery. Good thing I didn't pay when I arrived, innit?
So, if they ask you to pay before performing any service, just insist that you'll pay at the end