I'm organizing with some friend a travel to Ireland from first January to 6th January, we arrive in Belfast the first day in night (at about 22pm) and depart to come back to Italy on 6th January at about 16pm (the first idea was to stay only in Dublin, but the flight is about 200€ more expensive)
So we want to sleep in Belfast first and last night and the other 3 night sleep in Dublin. We don't rent any car, we have plan to take the train from Belfast to Dublin.
Any suggestion about hostels where sleep, cheap resturant, pubs (

