My brother and I spent a week at Shirley's apt in January and had an incredible time. It was the perfect space for 2 people; the apartment was spacious and we each had our own bathroom. Bedrooms and beds were large and accommodated a king bed as well as a desk for working. The patio outside of the kitchen was an added plus for getting some sunlight with that morning cup of coffee.
Location is incredibly convenient; walkable to a variety of restaurants and taco trucks, and the easy access to the river/trail was a huge plus. It's also about a 10 minute car ride to pretty much everywhere in Austin you want to go - downtown, East Austin, SoCo, Zilker, Barton Springs, and the airport.
Shirley and her team were also incredibly responsive; they always responded to my messages within 5 minutes.
I really enjoyed my stay and would absolutely come back.