Ron's Bedroom is at the top of The Burrow, right underneath the attic. It's decorated with merchandise from his favourite Quidditch team, the Chudley Cannons.
From the Story[]
Discovered in Book 2, Chapter 3, The Burrow[]
"Ron’s bedroom is small and has a sloping ceiling. Usually a mess, almost every inch of it is covered in bright orange Chudley Cannons Quidditch team memorabilia. It is right underneath the attic, so The Burrow’s resident ghoul can be heard moaning and banging on the pipes."