I would strongly recommend this apartment as a good value base for exploring Istanbul. The location is excellent. The views from the balcony are stunning, probably better than the photos on the listing. The room though is smaller than the listing photos would suggest. It is a medium sized hotel room. Perfectly adequate but not a lot of spare space. WiFi worked well. We had problems on two of our eight days with hot water and heating. I think this was probably due to an unusual cold snap. The problems were quickly taken care of. We did not get to meet Bilge but she always responded very quickly to any of our messages.
You have to be able to do stairs to get to the first floor where the elevator commences.
Although there is no kitchen, and almost no cutlery, there is a very good little fridge.
We used the Hammam next door. It was very good, despite mixed reviews. Unless you have to have wine with your meal the two restaurants just up the street are to be highly recommended.