My girlfriend and I stayed in Istanbul for a week. I advise all travelers in Istanbul to stay in this apartment. Excellent location. Close to the metro Sishane and to the funicular to Karakoy. 10 meters from the lively Istiklal pedestrian street. Therefore, there will be no problems with where to eat or where to take a walk. At night, sometimes it can be noisy. But you definitely need to settle here.
The apartment almost matches the photos. Some furniture is not in the best condition, but this is not a big problem. The bed is very comfortable and large. Bed linen and towels are clean (set for 2 people). All facities are in the apartment: iron, refrigerator, air conditioning, washing machine - everything works. The kitchen is very small and on the stove you can hardly get a lot of food, but most likely you will have dinner in the city (there it is tasty and inexpensive). Bathroom is a little disappointment. No curtain and toilet paper holder, and little space for cosmetics and other toiletries. Wifi in the room sometimes works intermittently, but the owner assured us that this is due to government blockages.
A few words about the owner. Ayhan is a terrific host. He was always in touch, he was ready to help. Suggest a couple of very tasty places in Istanbul. Upon arrival he met us at the metro station and treated Turkish coffee.
I think you'll like at Ayhan's.