Pinar's flat was a disappointing experience. The main difference from the photos is the bathroom - it's really old and needs remodeling badly. I even wore flip-flops in the shower. There is no shower curtain or separation of the shower area, so water gets all over the bathroom floor. Despite what the listing said, there was no shampoo or hair dryer. The neighborhood is also rough - really poor and not somewhere I would want to walk at night alone.
We booked Pinar's flat very last-minute after another host cancelled, which was very flexible of her, but 45 minutes after booking she informed me the flat was being painted and we had to stay in another room for the first night. The "other room" turned out to be a room in her nephew's downstairs flat. We had no idea we would be sharing a flat for the first night, and the flat we booked wasn't ready until 7 pm the next evening because they hadn't cleaned it. She didn't offer us a discount or anything for staying in a shared flat instead of the one we booked, or for the very late check-in.
In summary - this place might be fine as a long-term choice for students on a budget, but if you're in Istanbul for a few days and are looking for a nice place, stay somewhere else.