When they ask those kind of vague, conversational type questions, they're not looking for a literal answer; they want a conversation starter for the interview. They also want to appear laid back and as mom & pop-ish as possible. So don't try to nerd out about coffee the way you might feel compelled to do with tea. (Coffee to tea is like checkers to chess. There's really not much to it.)
What I like about coffee is that ninety-percent of it is garbage, which makes finding the remaining ten percent a real treat. That reminds me of a very special ski-weekend in Stowe Vermont...make up the rest.
I also really like the smell of coffee beans.