We stayed at Demir's for two weeks in august and had a wonderful time. The bohemian neighbourhood of Yeldegirmeni is full of arty cafés and cheap food stores, it's an oasis of peace at a twenty minute ferry ride from the touristic frenzy of Sultanahmet and Taksim.
Demir's place is probably not very suitable for babies or toddlers, but my 6 year old had a great time playing in the garden. The appartment is spacious and the cleaning was flawless. Our host always made himself available within the hour to bring any basic equipment that was missing. We would definitely come back. Thank you Demir!