You can essentially show up with your toothbrush/toothpaste and a change of clothes and you are good to go. :) Everything else is there. Isle of Palms can be crowded, busy, and touristy, but this space is set just far enough away from that to be quiet and calming. We walked to every meal and there were enough options that we were able to eat somewhere different each time. Beach access was easy and the unit came with beach necessities.
If you need total darkness to sleep, bring a sleeping mask. The unit is fully east facing, basically parallel to the Atlantic coast, so you experience the sun even before it fully rises. Which, by the way, you should get up early and walk to the shore to watch first hand. So beautiful.
We'd definitely stay here again.