2. Sunlight helps ideas grow
The next issue relates to natural light. Your goal should be to work in an environment with the maximum possible amount of indirect sunlight. If this is difficult or impossible due to the orientation of your building, install a table lamp for when you need to focus on a document and a floor lamp for ambient light. To work efficiently, use energy-saving light bulbs.
For windows, install blinds or curtains that let light pass through while preventing uncomfortable glare, especially if you work with a computer or with screens.
You should also try to organise your day around the sun. Sound weird? Humanity has been doing it since the beginning of time with excellent results, making us the most productive species on earth. Work starts at dawn. And finishes when the sun goes down.
This way, you will be able to work to a schedule, something especially useful and healthy when working from home.