We had the most wonderful (nearly) two weeks at Eric's flat over New Years.
The flat is in a great spot in Brooklyn - close enough to the station to walk, but far enough to be away from the noise of the city. It was so easy getting in and out of Manhattan on the subway and much faster than I expected (you also get a great view over the bridge each time!). If you're staying for at least a few days and plan to travel quite a lot, I would suggest to get the 7 day unlimited pass which is excellent value and can also be used on buses. We used the airtrain and subway from JFK to get to the flat, which was a really easy and cheap route. Eric also kept us updated on subway closures from the airport, so that we wouldn't run into any trouble travelling - very much appreciated!
I would definitely recommend visiting Williamsburg - great cinema, little shops, and plenty of places to eat - definitely try Sweet Chicks and Pies & Thighs for some great southern food. We'd also recommend Nana Ramen on Malcolm X Blvd for some excellent late night ramen (they also have an ATM in there with the cheapest withdrawal fee we found) and Saraghina in the opposite direction for wonderful coffee and brunch. And don't forget to stroll around central park - it was absolutely magnificent in the winter sun and I had the most content afternoon with a coffee watching the ice-skating.
The house itself is spotless and full of all the amenities you'd need. Eric kindly came in half way through our stay and changed the bed linen, which are the small touches that really separates this place from the rest. The bed is the most comfortable I've ever stayed on at an airbnb, and the house itself was perfectly warm throughout the cold days - I always bring my hot water bottle wherever I go just in case, but it wasn't needed even once. Eric let my friend leave her suitcase with them at the flat on the day of her flight so she wouldn't have to drag it around the city, something she was greatly appreciative of.
I would definitely recommend catching some Broadway shows if that's your kinda thing (I saw Waitress and Mean girls, both were fab!) - the TKTS booth in Seaport was great for getting semi cheap tickets . You can do a walk over the Brooklyn Bridge and come out right at Seaport, with the booth only a 5 min walk away.
All in all, we really had the best trip and staying at Eric's flat really was the icing on the cake. I cannot recommend this place enough.