Hotel Yasmak Sultan is the only place I will stay from now on when in Istanbul! It is located adjacent to the walls of the Topkapi Palace in Central Sultanamet and about 50m to the tram that takes you across the Bosphorous River. The hotel is beautiful and the staff cannot do enough for you. The spa has a pool (swim bonnets required FYI), and there are spa packages available including the Sultan Package to get a Turkish Bath experience. The restaurant The Olive is on the rooftop and has a great selection of food and drinks with the most amazing view in Istanbul - overlooking the Bosphorous River and Galata Tower on one side, and the Hagia Sophia and turret of the Topkapi Palace on the other side. The service is top-notch with fast but informative check-in, a free Turkish Coffee in the Sultania cafe on the ground floor, and the spa staff is quite efficient. We stayed at another hotel in Sultanahmet that was twice the price and Hotel Yasmak Sultan is far better. Request a room on the 5th floor if you can - there is a bit of a view but you can walk up one flight of stairs to the restaurant for breakfast, dinner, or to sit in the cocktail lounge. I highly recommend it!