I stayed at Edip's place for two weeks and enjoyed my stay there. The location is good, as its very close to Nisantasi, which is a lively part of Istanbul, full of great cafes and restaurants.
The apartment itself is very cosy and clean and has a terrace. I particularly liked it because it's a loft apartment. The first thing you'll notice when you walk into the flat is that it's filled with books, from top to bottom. I personally loved this!
Two issues I had with the apartment was that WiFi was very weak and the people living below were awake and loud during the early hours of the morning, which made it almost impossible to sleep.
Despite this, I would still recommend the apartment because of it's location and Edip was a great guy to deal with: very laid back and helpful.