This is s great option when going to Manhattan or Brooklyn, or indeed any of the boroughs.
Very easy to get to area from JFK, air train and then metro subway, just follow Kwab's instructions. It's about a 15 min walk from station on A or C line Utica Station. The neighbourhood is great, safe. Kwab's place is close to a nice bakery, dry cleaner, fire stations and many 24 he convenience stores. There's a nice secure grill on the front of the flat. Inside is comfortable (very nice mattresses and sheets) and there are 2 bedrooms and a sofa bed. Good cooking gear, implements and fridge. Comfortable lounge area and TV.
Brooklyn is itself very interesting and worth looking around near to Kwab's place, a really nice neighbourhood with brownstone terraces. But it's not far from Manhattan, some 20 mins by train, especially if you take an express A or C train (and don't forget to check out the Btooklyn Museum).
So dont stay in Manhattan, stay in Manhattan. You can even get the 30-50% discounts to many Broadway shows all day from a booth in the Metrotech Centre (TKTS) in downtown Brooklyn. There are often no queues there, and for night performances only, in contrast to lining up with the hordes after 2 pm in Times Square.
Highly recommended