The place is the best in the very center of Sultan Ahmet. 5 minutes to the Aya Sofia and Blue Mosque. The terrace is big and the view is great. There is a great restaurant opposite where you can order the meal and they bring it to your apartments and you could have a nice dinner on your terrace with comfort and view to the sea and street. When you stay here, you can feel all vibes of Istanbul or even Byzantium, because the ruin of the wall of the hippodrome you can see right close and also Byzantium cistern which placed in one of the nearest shops along the street (the main cisterns were closed to restauration).
Wahid was very courteous and he arranged our check-in after midnight.
Must warn that if you have one of the members have to use a disabled carriage, this is not the best place to stay, because the house has a lot of stairs.
Overall, I highly recommend this place!