We stayed one week in Ahmet's apartment. It was nice and cozy, enough space to host 3-4 people. Ahmet was a great host, check in was easy and we could always reach him for further information. The apartment is not far from Taksim and easy to find. But if you come with a lot of luggage be informed that access can be a bit tricky as streets are quite steep as many in Istanbul. Good value for money, would stay there again.