We have a linen closet that for a time in my childhood was emptied out and made to serve as the “Nintendo room”, containing an NES hooked up to an old Commodore 64 monitor. I still associate that fabric/crafty smell with 8-bit gaming.
I also love the smell of sun soaked dog fur.
A single scent: it’s a tossup between mesquite or coffee.
A combination of scents hitting your nose like an olfactory blitzkrieg: that first step into an Indian restaurant when you get hit by a combination of different curries, naan bread, and the rest of their menu that they’ve been serving to customers over the last several hours.