Have been to Turkey quite a few times. as I speak Turkish. My best guide, ever, is Gulum (my Rose) Obruk, gulumobruk@yahoo.com
The Çırağan is the very very best hotel there. Be sure to eat at the restaurant under the bridge, a short walk from the hotel. AND the restaurant IN the hotel is fabulous as well. By the way, it is pronounced Shiran Palace.