Bonjour Chloé,
How nice that you are planning a trip to Dublin with your students!
As far as I know, hostels should accept groups of teenagers as long as they are accompanied by an adult, but it's still up to the hostel to decide, so I'd try contacting them in advance, especially given the size of your group. You can find an overview of Dublin's hostels on
our search tool.
Generator Hostel and
Abbey Court for instance, seem to accept school groups as long as they book an entire dorm.
Here's also
a handy guide to organizing school trips you might find useful. Do you already have ideas of what to see and do in
Dublin with your group?
A bientôt,
Antoine