It was an excellent experience. Hotel is centrally located, yet with a very quiet ambience. It is roughly 200 meters away from the main attraction of Sultanahmet Square, where you’ll find Hippodrome, Blue Mosque, Hagia Sophia, Topkapi Palace, Mosaic Museum, Basilica Cistern (across the road) etc. The Bosporus Strait, Galata Bridge, Grand Bazar, Spice Bazar are also very nearby. Additionally, if you buy Istanbul Travelkart (valid for every means of transport) and use the public transport, then the nearest tram station, Gülhane station is just one-minute walk from the hotel.
Apart from the position of the hotel, staff of the hotels are very cordial, always ready to help and every time they will greet you with a broad smile and it is true for each and every staff member. And it is also true for any part of the day, be it in the morning or at midnight. Mind it Istanbul never sleeps. All the activities (other than the museums, which have a fixed time-schedule) continue the whole night and to the morning. Another advantage is that the main door is never closed and it is always open.
Breakfast menu is also full of varieties and quality.
I would highly recommend Sirkeci Mansion.