Dilek is a great host! She responded to all of my questions very quickly. On top of that she gave me important information about Istanbul and recommendation for restaurants and activities.
Her flat is near Taksim, the tourist center of Istanbul, so you will be near restaurants, clothing stores, souvenir shops and exchange desks. The flat is also near different bars and the train station is not very far away by foot.
If you want to go to Istanbul, I would highly recommend you to get in contact with Dilek and take a reservation for her flat!