Dilek is reliable and welcoming host. Though we haven't met her in person, she gave us very clear instructions about everything and managed to pass the keys to us on New Year's eve(!). Communication was fast and easy.
About the apartment itself: everything was as described and exactly like at the photos, location is superb!
There are some things that you can't see at the pictures: (at least in winter) the air gets really humid due to location on the ground floor. Also it obviously (as the old buildings in Istanbul have no central heating) gets quite cool in winter, keep in mind that the boiler needs some time to heat the air and water. Taking a pair of slippers might be a good idea in cold time of the year, although the floor is partly covered by carpets, stepping outside of it can give you chills.