Ömer is a great host, friendly and responsive. His flat is great, as described. The room is cozy and bright, and the private bathroom is spacious and modern. The shared living room and kitchen are state of the art. The flat is in a highly secured building with a full grocery store next door. The flat is 25 min walk from the heart of Kadıköy (my favorite place in Istanbul); and from there you can take a ferry or metro to anywhere in Istanbul. I highly recommend this place :)