We would recommend the appartment of Saban. The appartment is clean, well equipped with everything you need in the kitchen. The location is in the Sultanmet district, near the tourist attractions of Blue Mosque and Aya Sofia. It's a quiet area, with enough restaurants and supermarkets nearby. The trainstation Kumkapi, which is one the map the closest train/metro station was not open during our stay. The nearest is Beyazit (which means a heavy walk upwards). We loved Istanbul and enjoyed our stay!