I didn't have the pleasure to meet Demet, but she was always very quick in answering all my questions and giving me very helpful tips. The flat is super clean and there is everything you might need for your stay. You can find a pharmacy and a couple of grocery stores within walking distance. In 5 min walk you can reach the metro station that takes you to Kadikoy (10 min), where you can take the ferry to the European side. Perfect stay, I highly recommend it!