Good points: Işık is a professional host with good English proficiency, Responsive and caring about details to make the stay comfortable specially if this will be your first time to Istanbul. The location is just 2 minutes walking distance from Taksim Square, where all kinds of public transportation available. Supermarkets, restaurants and Live Istiklal street are nearby.
The apartment is comfortable, fully equipped, hot water available. Wi-Fi is good as well. You will find also Satellite channels "Hot Bird" available as well as Turkish channels.
Area to be improved: ventilation in the bathroom and absence of window in the bedroom.
Generally, I'm recommending the place as It's a good option for the value of the money in a central location.
Thank you Işık for your welcoming gesture and professionality :)