The workshop will be held in Thompson Conference Center at the University of Texas at Austin. See maps and directions: http://www.utexas.edu/ce/tcc/attend/maps-directions/
There are many hotels around that you can stay at. Check http://www.utexas.edu/ce/tcc/attend/local-accommodations/. We recommend you DaysInn Austin University Downtown: http://www.daysinnaustintexas.com/ which is at walking distance to the university.
From Austin airport to the hotel and back you can use a shuttle. It can be reserved online. Note that the more people travel together, the cheaper per person rate, but on the other hand only one receipt will be issued per reservation (for all travelers) and this may be inconvenient in case of getting refund from different organizations.
Here is a link to the shuttle: http://www.supershuttle.com/ . The rates are as follows: $16.30 per person one way, $30.40 round trip; $28.40 for two people one way, $56.80 for two people round trip.