I stayed twice. The only downsides were that the first room was across the street from a hostel that had a barking dog. The second room did not have hot water; after no one could figure it out, I was moved to another room. This is why I ranked this four dots instead of five.
Overall, it was a very good experience and I would return. These are called suites but not regular room sized. However, they did have a kitchen sink, coffee and tea pots, burners and a small refrigerator.
Sultanahmet is spread among four buildings which have been beatifully restored. Bed is very comfortable and the overall facilities are very nice. There is no breakfast included, but that is fine with me because I paid only $40 a night and there were good places nearby.
Location is excellent for tourist attractions. The people who work there were helpful. Again, if I head to Istanbul again, I would not thing twice about staying there again.

Travelled here in the off-season. I booked this place online after favorable reviews. The only downside was that there was a slight funk in the bathroom. This was not an issue as we were able to keep the odor contained with the door. And its generally a non issue, as it is Europe, and really if you are traveling any city around Europe you need to be okay with slightly suspect smells. Enough of that though. the staff were uber helpful, the place was a short walk to most of the attractions, yet not on too busy of a street so we could go to normal priced kebab shops and bakeries. Had my laundry done by a lady down the street. And easy (relatively) parking ( 5 lira/day) within a block. We had a balcony and a view over the sea. It was beautiful.

I work as a hotel manager which means my expectations about hotel service when I'm on vacations are high. My friends and I stayed at Sultanahmet Suites Diamond Building and the experience was magnificent! We were a total of 4 and stayed comfortably in the standard suite for 9 nights. I want to start mentioning that the staff was very friendly and helpful. Maid provided clean and fresh towels every day. The bathroom was always impecable same as bed sheets. Kitchennette includes microwave, small stove, mini fridge, and sink.

The hotel is located upon walking distance from the Hippodrome, Blue Mosque, Ayasofya Museum, Topkapi Palace, and Basilica Cistern, among others. If you are staying for many nights you may buy groceries at a nearby mini market. Also there are many restaurants around. Our favorite restaurant was BB'Q House (american name but totally turkish) located in the same street as the Basilica Cistern.

Overall experice...Fabuleux! We are planning to return to Istanbul again in February and definitely staying at Sultanahmet Suites.

Stayed in the Emerald building of suites. Penthouse. Wonderful view from the terrace but no comfortable furniture to sit and enjoy it. Park benches. Suite is large and comfortable and well furnished. The little things added up for the mark of 3 stars. Batteries in remotes were dead, light bulbs missing, terrace door does not lock, could only get wi-fi on the bar stool in the kitchen, drapes kept falling off of the rods and the foul foul smell of sewage in the bathroom. Unbearable. Put towels and dishes over the bathroom drains and seemed to help. They do not use traps for some reason.
They charge for breakfast which did not look that great. Most hotels include a fantastic Turkish breakfast. Friends stayed in the basement room (also nice but very small) but again the sewage smell was not good and stayed only one night. Nice apartments but could do to look at the details and do something about the bathroom sewage smell- an easy fix. Happy Travels.