Leon would like her on the simple principle that she plays Quidditch, and she's a housemate. He's pretty much the center of hate on campus, but if she's okay with his snarkiness, I think they'd be casual friends, maybe?
I think as long as she gets to see something other than just snarkiness, they could certainly manage a casual friendship! Besides, there's got to be at least a couple people on campus that don't hate him, right?