We recently returned from our stay at the Four Seasons at the Bosphorus, and it was wonderful. The grounds are stunning, the rooms are very clean and comfortable, and service was perfect. The restaurants are great. The breakfast buffet was excellent, with great service. We also had dinner twice outside in the glassed in seats on the Bosphorus. Wonderful view, great food, and great service. The sunset Bosphorus cruise is a must. Great way to see the city, with great views. We also stayed the the Four Season Sultanahmet, and the hotel is not as impressive as the Bosphorus, however, the Sultanahmet is in a great location to see the Hagia Sofia, Blue Mosque, cistern, Bazaar, ect. One strong selling point for the Bosphorus is that you can sleep in. At the Sultanahmet, the call to prayer at 5:45 am is loud, you aren't sleeping through it, we tried.