We had a wonderful stay at Elif and Marco's apartment in Sultanahmet. They were welcoming and helpful throughout our stay, including arranging our airport transfers for us with trusted drivers and assisting us when we hit a few snags - an issue with the water heater and then with the door lock. Elif made herself available even at 1am, though I felt terrible that she did so!! They are such lovely and kind people, and their apartments are comfortable and very well-kept. Highly recommended!