Had a great stay at the Riverside Gem. Very central to everything lively downtown. If walking is your thing, you can definitely get to the hike and bike trail, South Congress, Bouldin Creek, and Rainey Street all from the Airbnb.
Everything is also less than a ten minute drive or Uber as well, from Zilker Park to 6th Street.
The Airbnb had everything I needed for my long stay, sans a washer and dryer. Parking around the block can be a hassle with groceries and laundry, but was otherwise convenient as well.
I had a great time seeing what Austin had to offer and would definitely recommend. :)