Sean and Mira are very welcoming. They made us feel like we could ask for anything.
About the rooftop... it was our treehouse for a week. Nice vieuw waking up! It is easy to set up although I was a little short (1m58)...that made it harder to reach everything. The truck comes fully equipped. Only downside is that if you want to go and see something by car you have to pack everything.
Maui is great. We went everywhere. The car is made for windy narrow roads. And for giving 'housetours', people are really attracted to the tent!
So in conclusion: we had fun. Hopefully you do too!