We stayed for 10 days at Ayşe Zeynep's place in early March. The location is excellent--close to the ferry and the Moda neighborhood.
I recommend this apartment if you are a tourist only spending a few days in Istanbul, but absolutely do not recommend staying here if you are staying longer than 5-7 days. When we arrived, the refrigerator was packed with food, leaving little space to put groceries in (an added difficulty given that restaurants were closed, meaning any traveler would need to cook). Furthermore, all of the drawers and closets were filled with the host's stuff, meaning we had to live out of our suitcases rather than unpacking any clothing. Finally, the laundry machine contained dirty towels when we arrived. The apartment is clearly lived in, which is not functional for an extended stay.
That being said, the apartment is highly proximate to Moda, the ferry, and the Bahariye neighborhood (about 15 minutes walking to the ferry). There are a lot of great cafes and restaurants around, and the apartment is a few minutes walking distance from the shoreline. Would recommend for a tourist coming to Istanbul for a few days.