Please book your accomodation yourself
You may book through this link
Add your arrival and departure dates, the number of rooms requested, and the number of persons per room. Then click “continue”.
Use the pull-down menu “distance” to sort the hotels accoring to their distance. Please select “Universität (C.A.R.L)”. This corresponds to the conference venue.
Another possibility for students is the A&O hostel Aachen Hauptbahnof. See here.