Stayed at the GOLD Istanbul Deniz Apartment. Pictures are accurate with regards to the view and a further plus, the living room in the Gold apartment contained a very comfortable day bed (unlike the picture depicted for it), which was a nice surprise. We spent a week at the apartment.
Pro: views, very clean flat, affordable and close to Istiklal Street, close to a taxi stand & authentic Hammam (Buyuk Hammam) also built by Mimar Sinan of Suleymanyi Mosque Fame.
Cons: the stairs for my 75 yo Father, despite transit being easily accessed it required several transfers to get to the Sultanahmet area, air conditioning could be improved as once the bedroom doors close they get stuffy quickly.

We really appreciated all the help Hatice gave. She also left a very nice jar of fresh cherries in the fridge as a welcome. In the past most host have left an information binder in their apartment that provide some information about the area (ex. supermarket, best restaurants, local attractions etc) which was not provided and would have been a lovely touch. I think in the past Hatice was so readily available at her Cafe nearby that these questions were answered personally by her, but it was Ramadan and her Cafe was closed so I did not get to speak to her as often and felt a little reticent about bothering her so frequently to ask these questions. Perhaps a binder with this info in the apartment would be useful? Overall very happy with this lovely space.