We stayed in Hannah's flat for 9 nights in June 2016, and on the whole, all three of us had a terrific experience. The flat is in a typically Brooklyn-style red-stone house, and is very hip and spacious. The décor is very nice and homely, and there is a lot of space. The host was very welcoming, helpful and easy to communicate with.
The place is advertised as a double bedroom flat, and both bedrooms are very nice, with the only disadvantage that you have to walk through one bedroom to get to the master one. The only thing one should consider before renting Hannah's flat is the somewhat strict house rules - shoes are not the be worn inside, the consumption of meat inside the flat is not allowed (and the host would prefer if the guests don't cook), and the guests have to use disposable utensils and plates. On the plus side, the hygiene was up to a very high standard, with nice clean sheets and towels awaiting for us.
The area is reasonably safe, with a wide variety of bars, cafes, and restaurants, with many food and price options, so the fact that you can't cook in the Airbnb is not the end of the world. The neighbourhood is fantastic - only a 10 min walk to Brooklyn botanical garden and Prospect Park, and you can really experience the atmosphere of Brooklyn there. The only disadvantage is that it takes 45-60 min to get to Manhattan - although the subway (5 min) and shuttle (30 sec) stops are very close to walk to, we were unpleasantly surprised by how infrequent the trains in the NYC metro system as a whole are.
In general, I would definitely recommend staying with Hannah in a great flat in a hipstery area!