I've lived in Austin and I would say it is bike friendly, but it will be tougher commuting depending on the area. It is truly "hillcountry" but I don't see this as a bad thing...just more of a workout! It's where Lance Armstrong lives and trains. There are definitely hills, but in no way are there mountains or super steep hills like SF. Also, there is practically no winter but man does it get HOT. But it's a drier heat. It is a VERY artsy city (with amazing music, animal-friendly, gorgeous scenery, and restaurants).

I've lived in 8 cities across Texas and I would say Austin is the most conducive to an outdoor lifestyle.