We stayed for two weeks in this apartment. It isn't huge, but bright and comfortable. We had everything we needed. The hosts were always really helpful and even left some water and snacks for us at the arriving. The free mini breakfast is available at the Cafe a couple minutes away on foot: it is of course a small breakfast but really tasty with a nice variety of food. About the street and the area: we were a little worried because we read previously that this area was a ghetto and that it wasn't really nice for tourists to be. But the street where the apartment is situated isn't exactly in this specific area (which is by the way easy enough to avoid). The street is really charming, you can find a couple small grocery stores, a fruit and vegetable seller and even a fresh bakery right down the building. All the locals were really nice.
The single thing that could have made the stay even better would have been the availability of a broomstick in the apartment, to help with the cleaning.
But overall, a perfect place to stay in Istanbul. 100% would recommend. Thank you Guner !