The Mercure brisbane King George Square hotel is very close, one block away by the Roma street entrance to the court or Traders Hotel in Roma street next to Roma st train station is one block the other way. They are the closest I can think of and are good safe options. There are lots more options within a few blocks of the court. There are also backpackers not too far away and also some B&B's. Check out prices and look on google maps for where they are in relation to the court.