Great location near the Sultanahmet area. Right near the apartments there are markets, shops, milk product shops, and fast food. Everything is cheaper than the streets leading to tourist attractions.
Speaking of which, you're 15-20 minute walk away from the Blue Mosque and Hagia Sophia, and 5-10 minute walk from the grand bazar. Near grand bazar you have public transport to the Galata tower / Taksim square area of Istanbul.
The apartment itself was great as well, and it included everything needed for our stay. From towels and hair dryer, to kitchen amenities. It also looks really nice and was spacious enough.
The host himself is friendly and is always up for a quick chat while passing by. He's also a hard worker working on multiple apartments to keep them clean and the residents happy.
All in all, can recommend.