The flat looks just like what you'd expect from the pics, actually a bit bigger. Joy was so kind to show us around the house, even though we arrived really late at night, due to flight delays and queues at immigration! It's a good location to explore Manhattan, in 30-40 mins you are in Midtown. It takes a bit longer to go to Brooklyn, so if you think you're going to spend a lot of time there, maybe better to look for something else.
We didn't spend much time in Harlem, but there are shops and restaurants close to the flat, which is handy.
We slept really well, comfy beds and quiet area.