Charlotte was a great host - there was a glitch in AirBnB's system that resulted in her not being notified that we had booked the property, and she handled it graciously despite it being about 9 or 10pm, making sure we were set up with everything we needed. The house, which is one of several smaller units on the property of the main house, is in a nice neighborhood in close proximity to South Congress and downtown - still probably about 1.5 miles, so you will need a car, bike or Uber to get most places.
I would call the place rustic. It was a bit smaller than I expected looking at the pictures, and had the basic amenities but not a lot else. I thought it was a bit overpriced, honestly, and would expect more amenities for the cost (i.e. laundry), but the listing is accurate. I'm not a neat freak when it comes to cleanliness so it wasn't a big deal, but the place definitely could have been cleaner.
Overall, I think you'll find this a perfectly nice spot to stay during your trip to Austin.