We had an amazing time at Idil's apartment. Very clean and tastefully decorated. All the bed sheets and towels smelled lovely. Location is ideal as in the heart of the trendy area in Istanbul. Great places for breakfast, lunch & drinks are walking distance from the flat. It is still part of the old centre so streets can be noisy at night if you are a light sleeper and you might get woken up by the call for the prayer at 6AM but that's part of the Istanbul experience and only lasts 5min :-)
Idil was incredibly fast and responsive when we asked her about advices/tips for Istanbul and sent us a very very long list of recommendations which we have tried and all of them were authentic, local & fashionable. Much better than any guide book you could buy! We are forever thankful. I would highly recommend you stay here in your next visit to Istanbul