My wife and I stayed two nights while we explored Austin on a random Monday and Tuesday in December.
This is a really special place. You see how it grew over time - it is obviously a living building built by creative hands.
The view out over the backyard is great to take in each morning while you're enjoying that quiet time before starting your day. The path leading from a generic residential street to enchanted little world of the treehouse and its backyard are not to be missed.