This place has lots of space and can house up to 6 people (if the host permits), so could be an important feature for a bunch of traveling students, or, say, a family with 2 or 3 kids. The place is very clean, and has a fully-equipped kitchen and bath.
Two things were not working (air conditioner in the main/sitting room and blinds in the bedroom) which is the main reason I gave 4 stars. As someone mentioned before, there is only a tiny cocktail table which would be a problem if a group of 5 people wants to have a take out dinner, but for two people as in our case this was ok.
The location is good in terms of easy connection to both lower Manhattan and JFK, but there is not much in the immediate vicinity. A more energetic part of Williamsburg is in approximately 10-15 min walk to the north.