Olim's listing was an excellent home base for our group of 10 as we explored Staten Island. We had beds to spare, the space is like-new and the location is central on the island. Great value for a large group and we'd book here again.
(Note for those arriving by bus: GMaps' walking directions from the SIM bus stop take you up a back way straight up the wooded hill behind the house (especially not ideal at night). I would punch in your destination as a GPS coordinate up where the house's lane meets the main Terrace road, so that you can just walk down the driveway and enter from the front side of the house.)