This exercise helps you be more aware to the spaces you work within, and your motivation and focus in them.
You'll likely have different working modes during the day, perhaps somewhere to concentrate, somewhere to chat - so its important to keep track of not just the space you're in, but also the mode you're in.
Download the workbook, and keep a diary for a week if possible.
Once you have the data necessary, you'll start to see patterns, and complete your Manual of Me entry.