Akin is a very nice guy and he was most welcoming and helpful.
He even filled the fridge with food for us to make the place even more homely.
The flat's location is excellent. Really close to everything. It was clean and warm and we really felt comfortable staying there.
The only thing that could discourage someone is having to use a rather steep staircase to the third floor. You do get used to it after the second time though.
It definitely comes first on my list as regards accommodation in Istanbul.
Thank you very much Akif!