(Intending this to be a discussion similar to the tip about paper reading.)
I have a hard time focusing at my desk in my department. It's a little cluttered at the moment but not messy. I have a plant, a light source, a small hot drinks desk corner, and a spot for my laptop separate from my desktop.
I don't know what it needs, but I'm curious - what do you need in your workspace when you sit down to write/read/code?