"If you've met one Autistic, you've met one Autistic."
So it'd be best to let them speak for themselves.
Personally, I find predictable routines and schedules to be comfortable. Especially if I can tailor them to what makes sense to me.
I like to choose what I hear and what I see. There is some music I like in the background (especially Steve Roach and Robert Rich), and other than that I'd usually prefer to hear nothing. I'd like the TV to show things I like.
And my parents inadvertently did me a wonderful favor when I was young. They let me choose the colors for my bedroom. For me: Medium-dark blue carpets , cadet blue walls , glossy black furniture with light/white interiors , black curtains light-blocking! and black towel and washcloth . Obviously, others might want different colors. (I still have a black bedspread, and towel and washcloth and hand-towel!)
Places to be alone or at least partially obscured are nice. And walking alone in the woods is great!
Others might have different preferences.
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When diagnosed I bought champagne!
I finally knew why people were strange.