What "who" refer to?

[Brahman]

Dear experts,

May I have your opinions, please?

"John explained the theory to his taciturn friend at Steven's Cafe who was listening to him with bemused interest."

1. Is the above construction correct?, and
2. What does "who" qualify: "taciturn friend" or "Steven's Cafe"?

[Barb_D]

Is it really even slightly reasonable to think of a restaurant as listening at all, either with or without interest? Clearly, it's the friend who is listening. You can argue that the "who..." phrase is misplaced, but there's no possibility of confusion.