Overall: This is a great way to experience the island! We were able to do a lot of activities in a short period of time because we didn't have to go back and forth to a hotel room to change/grab more items for our adventures.
Van itself: The bed is comfortable and spacious, even with two taller people. All of the bedding and towels smell fresh and cleaned. The kitchen is spacious even being inside a van!
The back door was broken when we rented the van, so showering was tricky because the door could not stay open.
Definitely drive around & try to park in the sunniest spots - the van's battery died each night for us in the middle of the night (a loud siren goes off to let you know) where we only had a small fan going + were charging our phones.
Items listed: I would still bring some toiletries and other cooking items because it wasn't fully stocked when we were staying in the van, but this is easy to buy at a store after picking up the van.
Camping spots: Do your research and be sure to book ahead! Many spots book as early as a month or two in advance, some city camp sites book 2 weeks in advance. We stayed mostly on the North Shore - many streets with beach views that you can just park on the side of the road. The discreet van makes it easy to pretty much sleep wherever!
I would recommend this to my friends & family, as long the van itself gets some general upkeep (or they are handy people in case small breaks happen).