Perfect location (Galata / cihangir / kadikoy), very clean and nice apartment, easy check-in/check-out, available and fast to answer hosts.
One slightly negative point to keep in mind : the apartment can be a little bit noisy (noises from the street) for some people but we know it is part of Istanbul life-style.
Thanks again Emilio and Marian ! I definitely recommend both the hosts and the apartment