Robin's treehouse is a very, very special place.
I honestly can't think of a more fairy-tale like place I've spent a night at in my life. Here's why:
Once you're up the ladder and stairs, a vertical door opens into the treehouse. The treehouse itself is is much like a fire tower in its design; there is a balcony that goes 180º around the front and side of it, with a coffee table and stunning balcony looking westward towards the sea. The house is a tent-like structure in the back with a queen sized bed positioned perfectly for views looking out of it on three sides. Looking out the front of the tent from the bed, the valley opens in an expanse of rolling, pine-covered hills leading down to the ocean coast many miles below. I remember waking up in the early morning around 3/4am and seeing a dreamy nightscape of blue-bright stars and rolling clouds over the sprawling hillside; it struck me that feeling that this was the nature bungalow I always wished could be real in my youth.
Beyond the space itself, this spot is distinguished by the kindness, attention to detail, and accommodating style of the host Robin. Our stay was planned for a late night after a baseball game up in San Francisco; we knew that our schedule would be tricky and were hesitant to even go forward with the stay, but thanks to Robin's willingness to make it work for us, we were able to stay in one of the most incredible places I've ever had the pleasure to rest my head and sleep at!
A few other notes - as far as the safety of the treehouse itself, it features a belay setup for anyone not comfortable climbing the rather short ladder up to the house. Although there is no bathroom in the treehouse itself, there is a very clean private bathroom in the house nearby that is dedicated just to the treehouse guests.
Private, serene, and stunning, I can't recommend this place enough.