We stayed for 4 nights at Pinar's place and it was fantastic! The apartment is very stylish and the rooftop view is amazing! The location is very close to great restaurants, a few historical sights in Istanbul, and a short walk to the hop-on-hop-off bus.
Pinar's communication with us was excellent and she was quick to respond if we had any issues! She provided great recommendations for restaurants, getting around, and where to pick up some great wine!
If you are looking to stay near the attractions of Istanbul, or even be in the middle of the nightlife, I would highly recommend staying at Pinar's apartment!