I would definitely stay there again! Eyup and Ahmet were super nice and easy to contact via WhatsApp.
The apartment is on the 5th floor (only stairs, good workout), clean, and is plenty big enough for 4 (two sharing a bed). It has everything you need—teapot, fridge, hairdryer, towels, washing machine, etc. (no oven, but I didn’t need one). The rooftop terrace is Huge and there’s a great view of the Galata tower—has a large table and chairs out there. There is some noise at night as it’s a popular area, but in my opinion it’s worth it for the location.
You can walk to most major sites and there are plenty of cafes, restaurants, souvenir shops, grocery store, ATMs, and SIM card store around. It’s a 5 min walk to a metro stop too.