Gizem's place is wonderfully clean, and has literally everything you will need. Her father showed me around the place, and although there was a language difference, he was absolutely charming, and thorough. Gizem was extremely helpful, and kept in touch regularly with messages. The apartment is actually much bigger than it looks in the photos. The area is hilly, as is mentioned. I had no issues with this, and as long as you don't mind the hills, this neighbourhood is wonderful. It is a peaceful place and felt very safe indeed. People were all extremely friendly, and I loved the atmosphere. There are plenty of grocery shops nearby, a barber, etc, and central Beşiktaş is maybe a ten minute walk (for ferries to everywhere, and indeed just for the place itself. Ortaköy was only a short distance away, and quite honestly, I found this whole part of Istanbul to be beautiful. The view from the balcony is wonderful. Enjoying tea on the balcony and listening to the calls to prayer echoing around the hills was a genuine highlight for me. I recommend this place unreservedly.