A great location on a quiet street (literally five minute walk or less to Blue Mosque and main Sultanahmet avenue with tram; plenty of restaurants/cafes in the neighborhood). The apartment boasts some amenity (small patio and deck); nicely furnished. Shared rooftop with enclosed lounging area (albeit up several flights of stairs) offers a nice view and a pleasant place to work if one has to (my son spent much of one day up there cranking out a report). The host offered some special touches (e.g. a bottle of wine, fruit, and city map on arrival) and was responsive when needed (clarifying how to use the washer). There is a small grocer, with fruit stand, just across the street from the apartment.
For returns to the airport a small hotel (Comfort Hotel???) just around the corner offers a shuttle service every two hours for just 10 euros per person.