It was a pleasure to stay at Hikmet and I can recommend it. He was a very nice host and helped us with whatever issues we had, such as ordering a taxi.
Hikmet´s place is situated in a relatively quiet (but close to a mosque) neighborhood within a 15-20min walking distance to Hagia Sophia7Blue mosque and 5-10min to Cemberlitas tram stop.
The room was spacious, clean and serviced every day just like in a hotel. They also offered breakfast on the rooftop terrace.