Sibel's place is exactly as advertised. The apartment was absolutely spotless when I arrived. She provides all of the basic amenities for you to use, including a few bath towels and clothes hangers. The sofa bed and pillows were comfortable.
A few notes for anyone who looks into specific details:
1. Toilet paper is 1-ply.
2. The AC can be a bit loud when it first turns on. Sibel made sure to ask me whether it was too hot or too cold, which I appreciated.
3. There is a hospital a few blocks away, so you will hear ambulances quite frequently.
Sibel herself was super sweet. I stayed with her for six nights and every day she checked in to see how I was liking New York as it was my first time in Manhattan. Communication was always very clear and quick. It definitely felt like I was staying over at a friend's place. Overall, I would stay at Sibel's again. The neighborhood felt safe and is very lively. There are numerous eateries and popular attractions within walking distance - e.g. the Empire State Building is literally down the street! I chose to walk everywhere during my stay though, so I cannot comment on the subway system; Ubers and taxis are plentiful.