We stayed here for two nights on a cross-country road trip over the Christmas/NYE holiday break. 10/10 would recommend staying here. The management company communicated very clearly and effectively. The apartment and building were also incredibly nice. You also can't beat the location if you want to have a fun time in Austin. That being said, E. 6th can be kind of loud at night (but on the bright side, there are a ton of bars/breweries, coffee shops, and restaurants literally outside the door).
Parking is a small extra charge, which you'll need to contact the management company about after you book. If you are planning on being there on a weekend or aren't comfortable parking on the street, I highly recommend taking advantage of the garage parking. It was really nice not having to stress about paying the meter or circling for parking spots every time we came back to the apartment. For street parking, download the park ATX app before you go.