I was greeted by Paul outise of his flat, he was very welcoming, very communicative and open to any questions we had during our stay. Great communication from his part, and we had a late flight back and let us stay beyond the checkout time although he was fully booked.
This place is on the J/Z line, like a few foot away. You can see the subway platform from the living room window. The noise in the living room was pretty intense at first. If your considering this place for 4 people I would not recommend it. For 2 with the bedroom in the back it's manageable but the neighborhood is pretty noisy... we stayed less than a week so it was fine.
The subway line is direct from JFK so that was pretty handy. The cool streets where a few stop away.
The wifi works just fine, no tv though (yeah who watch tv on hollidays, well after a long day exploring you might to just chill with some take out in front of the tv :D).
All in all, the low price is justified, you get a decent place close to Manhattan and Williamsburg.