Four days rent in Dublin

I need a place for just four days in the later half of March to repeat a college module in Dublin. Where would be a good place to look?

I'd rather not go back to the digs I was staying last year, even though I know they'd probably still have the room for me.

The college facebook page has been pending approval of my comment for the last 48 hours, so I basically can't get in touch with other students.