I spent 15 nights here and was very, very happy. The thing that really made it for me was the private roof terrace which is much bigger that the pictures suggest. Seeing glimpses of the Bosporus, enjoying the sun and the cool breeze every day was just heavenly. I also really loved living so centrally, I walked to the live music venues in Beyoglu most nights, and felt completely safe, the tram stop is a short walk away and will take you anywhere you want to go.
Ahmet who managed the property was always on hand, replied really promptly to any texts and tried his very best to make sure I had everything I needed. He went above and beyond, walked me to a hospital when I needed a PCR test etc.
The building and flat are quite old (or seemed so), the furnishings basic, and the bathroom always had a kind of dank smell, so it's definitely not posh or fancy in any way, but I had everything I needed and everything worked and what I really liked was the spaciousness of the rooms which weren't cluttered up with stuff, and the lovely high ceilings, and the little balcony - so overall, I can highly recommend both the hosts and the property, they will definitely be my first port of call should I come back to Istanbul one day!