Single and double rooms are available in numerous hotels in the area ranging from 2* to 5*.
We suggest booking through the website of the company HRS. Step-by-step example:
Currently (18 Mar 2016) single rooms start from around EUR 40 per night within 1km of the conference.
The website supports English language, too, but then the currency is set to GBP.
We assume no liability for any hotel bookings you may make with HRS, or any content of their website. We also have no business relations with HRS, we just recommend them because it is convenient.
You may also try http://www.booking.com which offers a similar service.