Deniz has one of the best options in the Asia side of Istanbul, his apartment is close to everything, markets, transportation, pastries.. etc.
Deniz is a very helpful person, he helped us with when we arrived and if you send him any question he will answer immediately.
Very recommended for a short stay, but I see it's not comfortable for long stays because his apartment needs some maintenance (especially the bed) and you will close windows all time because it's on the 0-floor you will forget the sun.
it's good for 2 persons only, outside sofa not enough to sleep on it even for a child.