I have to have music. Silence while working is just not productive. While I’m working (especially when tired, which is most of the time) I listen to trance/dance, because it keeps me going!
During the day natural light is fine, but at night a nice soft light is best, not fluros or a bright lamp.
Not really bothered about what I sit on, as long as it doesn’t hurt! (like my stool at work)