Nekati's place is right in the center of old sultanahmet. It's an easy 5 min walk to ayasophia and blue mosque, super close to most of the major restaurants. Grand bazaar is one stop out and emononu ( spice bazaar, Bosporous cruise ) is couple of stops from sultanahmet.
Nekati was very responsive and always willing to help. Very sociable and a fun to have person. He is always right below the apt( he has a carpet store) and always available and ado lives 400 mts from the apt and is always accessible.
He never made an effort to sell carpets to us but we needed up buying a decent antique carpets from him.
Totally trustable and you can't beat the location.
Highly recommend to stay.