You're a painter. You're a baker. You like to sleep with the windows open. You never take sugar in your tea. And you always double-knot your shoelaces.

The quote is saying that the person described is someone who has different interests, preferences and habits. They are a painter and baker, which suggests they are creative. They like sleeping with windows open, so they prefer fresh air. They don’t take sugar in their tea, meaning they don’t like it sweet. Lastly, they always double-knot their shoelaces, suggesting they like to keep things neat and secure.