There are many hotels and serviced apartments that you can book within easy access  (max 10 min walk) to the Brisbane Convention and Exhibition Centre, in South Brisbane, South Bank, the West End, and the Central Business District (across the river). A few of the closer accommodations include:

Rydges South Bank Brisbane
Rate: $$$
Rydges Website 
Phone: +61 7 3364 0800

Mantra South Bank
Rate: $$$
Mantra Website
Phone: +61 7 5665 44507

Novotel Brisbane South (Not open until May)
Rate:  $$$
Novotel Website
Phone: +61 7 3237 2524

Menso at South Bank
Rate: $$
Menso Website
Phone: +61 7 3844 1355

Vine Serviced Apartments
Rate: $$
Vine Website
Phone: +61 7 3123 5686

Ivy & Eve Apartments
Rate: $$
Ivy & Eve Website
Phone: +61 7 3844 4555

Soda Apartments
Rate: $$
Soda Website
Phone: +61 7 3844 9988