Mediocre cuisine, mediocre serving. By Istanbul standards, the price is above the average of a good-quality restaurant. They specialize in seafood, but 80% of the dishes are seasonal.
It's a beautiful place. If you are staying at the Radisson Istanbul sultanahmet, then I highly recommend walking to it, just 5 minutes.
The fish is fresh, the waiters are polite, the views from the window to the sea, the wine is delicious, the toilets are clean, what more can you ask for on vacation? Deserved 5 stars .