I had a really nice time at Ferhan´s apartment!
It is right in the middle of Kadiköy - super close to bars and restaurants;
also the ferry station for getting to the European side is only a couple of minutes walk away.
The apartment looks exactly like on the photos and Ferhan left us snacks and drinks in the kitchen, which was really nice (and came in handy).
I arrived around 2 o´clock at night, but Ferhan just waited for me to hand over the keys and was very welcoming.
Also, wifi was working perfectly!:)
I´ll definitely book that apartment again, when in Istanbul!
Thank you Ferhan!