My SO and I both live in Austin. We love it! We were both born and raised in San Antonio which is about 90 miles south. Moved up here in 2003 and I can never see myself moving back.
Like people have stated before, our weather is nice. It can get humid but definitely not as humid as Houston or Orlando, FL. Today for instance is very beautiful. We had a "cold front" blow through last night and it has only gotten up to 95 today! Considering it was a record breaking 107 a few days ago, this is a nice break! It doesn't get "cold" here until about December/January and even then it is maybe 45 degrees. Sometimes we even get ice and it shuts the whole city down.
Austin is a very liberal city. Grab lunch at Shady Grove and you can see gay/lesbian couples holding hands and nobody takes a second look. Same with walking downtown.
We have a great medical district, live music scene, and outdoor areas to hike and bike. A famous nude beach on the lake called Hippie Hollow which gets crazy during Splash weekend.