Zehra's place is a hidden gem, with texture and patina (along with some quirks) that you'd expect from an old building. High ceilings, ample natural light, tiled entryway, old handmade wooden doors, and some art nouveau flourishes made the stay memorable.
The only issues we had with the apartment were some dead light bulbs and low stock of toilet paper, but it was a last minute booking and I'm sure this isn't usual. The kitchen was well equipped for reheating some pastries and making tea, and if we wanted we probably could have cooked more. Bed was comfortable and the rest of the apartment was warm and cozy during cold and snowy days. As it was the end of our stay in the city, we were particularly happy to have a washer in-unit.
The immediate location might be a bit loud in the mornings, but it was very sleepy and quiet at night. This wasn't an issue for us, since we wanted to rise early to explore the city anyway. It's within walking distance across the bridge to the old city and up the hill to Galata. Ferries, trains, and busses are also nearby.
*Tip: under the ground floor entry stairs there's a little çay closet where a man who makes tea for the surrounding workers will happily serve you tea in your own glass or one of his for a few lira. Very convenient if you need a quick fix.