The Organizing Committee has pre- booked rooms for delegates in hotels centrally located.
Please reserve here http://congres.netbba.com/booking/etop-2015/
You can also see Airbnb website. Airbnb is a community marketplace where guests can book spaces from hosts, connecting people who have space to spare with those who are looking for a place to stay. Many guest rooms or apartments are available in Talence or Bordeaux for a reasonable price.