I stayed at Gulsen's place with my husband, 2 year old kid and my parents. The place is great - very fresh, nice style, very clean, cozy and pleasant to be in. 3 bedrooms and living room. Huge TV with Amazon Prime, Netflix etc - was superb for my kid ))).
Gulsen is super helpful and very fast to reply. Highly recommend the stay at his place!
He arranged the baby chair for my kid beforehand and brought us warm blankets as it was getting cold at nights.
The apartment also has a balcony with nice view! SO we enjoyed a lot!
The location is close to Galata tower and the area there is quite hilly, just bare that in mind when travelling with small kids :)