This. Pretty much any style of bar you want, from live music and trashy dives through upscale balcony.
If you're there for a bit, I'd also suggest the Alamo Drafthouse if you've never been to a theatre like that. And, if you have a car, go out to the Salt Lick and get a huge fucking plate of really awesome BBQ. You can probably even say hi to my ex's sister who works there
If Austin weren't in TX, and thus 500 miles from anything worthwhile, it'd probably be the best city in the US