When I was younger I liked the smell of unleaded gasoline in faint, distant amounts. I think it reminded me of my grandfather's tool shed where he kept the lawn mower.
I like cat breath. Hahaha. Cats are not that stinky to me, except their litter box I don't like of course.
I like the way my casual on off three year bf smells on his private area and sometimes he even tastes good to me, like I have licked his semen off of my face. I think that's chemistry though, some guys don't smell so great, some smell downright bad to me.
I also kind of like the smell of horse manure in very small amounts mixed appropriately with hay and grass on a farm as manure. Not up close, shit is THE most disgusting thing in the world to me, but on a nice fresh farm morning, there's something comforting about it.