The house was suitable for 9 people as described and the common spaces were very comfortable with the family table and the open kitchen. Check in and out through electronic code at both doors were very easy.
Clean beds and towels, enough room for all, the mattresses were more than decent. To notice that one of the room as two double beds.
With 5 kids between 7 and 11, I would maybe have chosen a location closer to the center of Manhattan to allow them to rest during the day. There are two subway stations nearby but it actually takes 20mn to reach Little Italy and about 50 mn to the center of Manhattan. The neigborhood was a bit less welcoming than other areas of Brooklyn, but practical with supermarket, pharmacy closeby. And the cheeseburgers we had at the City Bear nearby were definitly the best.