To me, this place is what Airbnb is all about: getting to meet exceptionally wonderful people who love hosting guests (and who happen to have an awesome Airstream and some farm animals in their back yard).
Marcella is a stellar host, and the Airstream is a spectacular place to stay for a great Austin experience. You're pretty close to restaurants, cafes, and grocery stores, but you're far enough away for the stay to still feel like an escape. What more could you ask for?!