We were a group of 9 adults and 8 children ages 10 months through 6. We had to bring a lot of baby gear, portable cribs and high chairs for 3 babies, one of which was overnight in the pediatric ICU during our stay. I also had to bring a lot of kitchen gear, mixer, food processor, large dishes for baking and serving, oversized cookware. Not nearly enough serving and cooking utensils were available. I cooked all 6 nights and used my own thick cotton placemats for every meal. I had to serve everything from the stove. I was afraid the wood finish of the dining table would get damaged. Also, no serving dishes big enough. Not enough dish towels. There was only one dish towel supplied.
On a different note, the house layout was great and the dining table was a nice size. The bench made it easy to fit a bunch of little ones at the table. The house was clean upon arrival and the hot tub was in good shape and clean. The arcade machine, foosball and pool tables were a big hit.
Towels! Very small and skimpy. I had everyone pack beach towels to use after hottubbing, and thank goodness. They supplemented the bath towels provided.
One funny thing was We all kept finding trace amounts of very naughty metallic confetti around the house. The previous group must have been a bachelorette party. The kids had no clue so it was all good.
All in all, I would rent On the Rocks again, and be better prepared on what to bring.