(( VaginaPagina ))

I know you said you don't feel comfortable talking to him, but maybe you can leave him a note or something? Just asking why he's banging on his ceiling/what he's hearing. It could be that the noise he's hearing isn't even coming from your apartment.. could be he's hearing the people downstairs but thinks it's upstairs. My boyfriend lives on the top floor of his apartment building and sometimes it sounds like the downstairs people are walking on the ceiling, and if people are on the roof we can sometimes hear that, too.

Either that or just ignore him. You've done more than enough to be considerate.