We had a great time. This was the cleanest rental house I've visited. The kitchen was well equipped, everything was very clearly labeled, and there was plenty of space for us to place all our things. As the listing says, you'll want to bring a lot of your own items (soap, toilet paper, etc), but there were sample size items for toiletries in each bathroom too. We took advantage of the beach and appreciated the beach toys and chairs that were at the house. We also loved that there was a supply of children's books, as we weren't able to pack too many.
Our only issue was with the linen rental company, but the property manager was easy to get in touch with and took care of that for us.
A couple safety gates would have been useful, given all the stairs, but we barricaded with furniture as necessary.
I would absolutely recommend Sea Rie-Treat to anyone looking for a place right on the beach. The only exception would be for anyone with difficulty navigating stairs.