Great stay and an alternate to the crazy rental car prices right now. Self check in is easy and Rebecca was very responsive both before and during our stay. Pickup location is about $80 and hour Uber ride, or cheap but 2 hour bus ride. Note that you will need to figure out how to get there if your flight arrives in the morning, since check in is at 3. We were able to check in early but it's not guaranteed ahead of time, so we had to figure out our own transportation to the pickup location. Van was clean and thoughtfully designed with plenty of storage (major high five for the fans).
Highly, highly recommend reserving a campsite (good luck getting a reservation) or having a plan for where to park overnight. Unlike the mainland, there isn't BLM or NF property you can easily boondock on. Options for "freedom camping" seem limited and you would likely be parallel parked along a road. If you are van lifer on the mainland, know you won't find anything on iOverlander or FreeRoam. We talked to others who were renting similar vans and they had middle of the night police knocks telling them to move -- we ended up opting for a friend's driveway after driving the perimeter of the island and not seeing anywhere that looked feasible.
This is my only reason for minus one star. The van is marketed as being stealth and while it is just a mini van, you can't really be stealth. You have to open the doors and setup the bed from the outside, so it's obvious you are setting up to camp. Also, you can't simply setup the bed somewhere else and then drive to a new spot because you need to push the driver and passenger seat all the way forward for the bed. So, the likeliness of you getting a nice beach front spot for the night seems low unless you are able to get a reservation at one of the beach parks (which seem hard to get).
Other than the logistics of parking over night, the van itself was great and the bed was very comfortable!