The only real negative about SA and Austin (in South Texas in general) is the heat. It can get Africa HOT here. Makes you not want to ride, at least with me. A lot of the backroads are very twisty west of I-35 that lead to Luckenbach, Fredricksburg, and the towns west of both cities. Just watch out for critters running across or tried and failed to cross the road. Austin itself is a great city to live in. It has a bit of everything, and even if it doesn't have you want I'm sure you'll find it close. 6th street, Town lake, Zilker park, live music out the wazoo. It's a great city for sure.
Attitudes are contagious. Mine might kill you