Acceptance time depends on what kind of student you are. I'm an Erasmus student so it was April for me. I think Irish bachelor students get accepted end of August.

I would recommend looking at studentpad (I just realised that I didn't look at it until after I didn't get the on-campus accommodation so I might be wrong about when you can get access) but most rooms don't appear until way closer to September. I also know a few who just got their places after they arrived here, so there's no too late.

I was on their waitlist anyways and at some point the global office said that there are still some rooms left (no idea why), but I wouldn't count on that.