It really doesn't get much better than the Four Seasons.
Besides the excellent location near all the sights in the Old City, the service was outstanding, even by Four Seasons standards.
When we arrived early from our flight, our room wasn't ready. The front desk took my cell phone number and told us to go and enjoy the sights. We did, and a short time later I received a call that our room was ready!
Also, while we were out, friends who we were meeting, called the hotel to say that they were delayed....the hotel forwarded the call to my cell phone.
I had informed the hotel on our reservation that it was our anniversary. We ate in the excellent Seasons restaurant, and for dessert that surprised us with champagne and a cake. Returning to our room later that evening a second anniversary cake was waiting.

I want to put in a word for Ercan Ergonen. He's truly an outstanding concierge and he made the hotel special. The hotel interior is basically standard Four Seasons. The location, however, is superb because it is in the middle of everything, yet quiet and secluded. We had to swtich to Ritz Carlton the last 2 nights of our stay because there was no room initially when we booked, and Ritz Carlton turned out alright but nowhere compared to Four Seasons in terms of concierge service and location. The Ritz Carlton, in fact, is really incovenient for tourists.

The Four Seasons Istanbul at Sultanahmet is an exquisite hotel that is elegant, clean, with impecable service. The concierge is one of the best I've ever seen and the staff are friendly and helpful. The rooms are luxurious with great views of the Blue mosque and Haya Sofia. The breakfast was to die for and the Seasons restaurant is one of the best in the city. Only thing missing was a pool! Without a doubt, I would stay their again

I don't see how you can't give this hotel a 5 star rating. I can't say enough great things about them from the staff, the room, the location. This is many times better than any other 5 star hotel I have stayed at. It was my wife's birthday and we could only splurge for one night, they made it unbelievable. They left a cake for her and were always bringing little gifts. The room was the most impressive room I have ever stayed in. The bed and bath, perfect. I am very picky and I always find little things that bother me, there was nothing here, they have achieved perfection.