Edibe Sultan Hotel is very suitable to visit the old town.
It’s 900 m from Sultanahmet and Gran Bazar of Istanbul, next to all the facilities (tram, metrostation, shops etc.)
I loved the courtesy, the hotel is not expensive at all. You may notice that the exchange rate is less cost-effective ( 1 € = 18.3 TL on Monday 15th August 2022) maybe find Istanbul a little more expensive than a few years ago.
Enjoy ur trip!