Accommodation is NOT included in your conference booking. There are many hotels of different categories, quality, and price in Brussels.
The closest hotels to the venue (around 10-15 minutes walk) are:
Thon hotel – 2 minute walk
Crown Plaza – 6 minute walk
When booking your accommodation do check the distance from the venue using something like googlemaps before booking. The venue address is: Boulevard Roi Albert II 1, 1210 Brussels, Belgium