Spent just shy of one week at the house with my family and brother's family at the house at the end of July and the kids LOVED it. There was enough room for 2 families not to get in each others hair. The black sand beach is literally across the 2-lane street. You can play in the front small cove area or also walk around to the left, behind the life guard station to explore more back there. While there we saw turtles every day.
As others stated, the house does get warm in the afternoons. We found the best way to combat this is to draw the curtains over the west facing windows, turn on all the fans and circulate the air as much as possible when you get back. If it's still too hot, just go to the beach until it rains or gets cold. Problem solved! We did sleep with the fans on and windows open and it does cool down at night. (**If you typically only shower in the morning - shower at night while in Hawaii.**)
Although it was pricey when we booked, I would still definitely recommend the house to others!