Beautiful, clean, well-thought out space. Location in the redwood grove within the circle of trees is inspired, and the skylight allows you to fully enjoy it. If you're worried a treehouse stay might be too rustic, put those fears aside - it essentially operates as a fully appointed two story one bedroom apartment. Check in is easy and contactless (I'd load them ahead of time, though, as the treehouse itself not immediately apparent from the road and service is spotty). Also quite convenient to downtown.
There's a thermostat but nevertheless it can get on the cold side. In May, however, we needed no extra blankets. It has a keurig, stove and microwave but has no oven, so plan accordingly if you want to cook. Lastly, if you're light sensitive, you'll be waking up with the sun. There's no way around it. I promise you'll be glad for the natural light the other 23 hours of the day.
TL;DR: A unique, beautiful, comfortable, convenient way to enjoy Santa Cruz and its greatest treasures, the Redwoods. Highly recommend!