I'll keep this short and sweet! If you are looking at reviews for this rental, you should absolutely book it. This is by far the best way to see the island in as much or as little detail as you want! Seriously, BOOK IT.
Now, if you still aren't sure, here is the long version;
Sean and Cece share a wealth of knowledge about the island that my wife and I's 30+ hours of googling couldn't even come close to.
The cost of this is an insane deal, considering that any other way you need to pay about this much for a rental car, plus crazy high tourism and hotel fees.
They let you go up the mountain, which we have found is not the case for a lot of other rentals. (just use low gears on the way down.)
You can explore whatever part of the island you feel like, and these two will help you find alternative spots to overnight camp. (This is a HUGE help)
You will have EVERYTHING you need for a successful trip.
Seriously, you can't beat this if you love a good adventure!!!