Except the passport picture request which we refused (cfr. airbnb conditions), the stay went very well. The apartment was very very clean but also handy and the living room has a beautiful view to the Bosphorus. The school next door “rings” from 8 AM. It is a recorded ten seconds song not too annoying but if you plan to sleep late in the bunk beds room then you may need ear plugs. However for the center of a big city the neighborhood is reasonably quiet at night and we slept well.
Hatice provided a set of pictures to reach the apartment easily. The wifi was working well and our host helped us whenever necessary during the stay via the airbnb messaging. The M2 metro is at five minutes walking, Galata tower with bars, restaurants and a high terrasse with amazing view at ten minutes walking, galata bridge with T1 tramway to historical center at 20 minutes walking (steep streets).
I would recommend the apartment.