Umm, could you keep it down just a bit? This is a shared space, so we need to be thoughtful of everyone here.

Umm, could you keep it down just a bit? This is a shared space,
so we need to be thoughtful of everyone here.
あのうもう少し静かにして頂けますか？
ここは共有スペースですから周りの人への配慮が必要です。