My favorite thing about this place was the property itself- a gorgeous piece of land, something between tropical jungle and a Southeast Asian monastery. A short but steep hike down a cliffside trail brings you to the ocean. No beach but lots of big rocks to sit on and contemplate. Then if you hike up the nearby stream for a bit (we weren't able to find the trail so we were jumping on rocks and wading), you arrive at the bottom of a breathtaking 150 ft waterfall. It's not a tourist location, even off the beaten track for people who stay at the retreat, and we were all alone. It was one of the most memorable activities during our whole stay!
As to the people there, Raphael and Kutira run an eco-lifestyle program that hosts a handful of volunteers. They help run the Airbnb and were nice and helpful. The only host I met was Raphael, who was pleasant and even shared some tips on meditation when I asked. Some other reviewers mentioned feeling uncomfortable with the people there. I can see how it might get unsettling with the volunteers/hosts going about the house, especially late at night, but in my experience they were harmless and just doing their own thing. Generally they have that sort of peaceful, spiritual, earth-loving vibe, which even if you're not into, make them pleasant to be around.
The biggest thing to consider about this place is probably its location on the island. You're definitely not getting a resort-style experience and it feels like you're retreating into a secret jungle paradise after a day of Maui adventures. To get there from Paia, the nearest town, it's a 20 minute drive on a curvy (but easy) highway then a strip of dirt road. For the dirt road, most people had Jeeps or 4WD's, but we were able to get by in a small compact rental - just be prepared for bit of a turbulent entrance/exit. Paia was also the closest beach. The more popular beaches, like the ones near Kihei, were maybe a 30-40 minute drive away. One thing we learned was that there are something like 14 microclimates on Maui. We were there at the start of March and the Airbnb was mostly cloudy and windy with a bit of rain, although still warm. It wasn't a big deal since we could just drive to Kihei and the sun would bust out and we'd get our hot dry Hawaiian beach weather. Just be prepared to be driving around a good amount to get to places!