The beds were very uncomfortable, the rooms were extremely warm at night, no lockers in room/no metal cages under beds for belongings, our room in particular was a bit cramped for 8 people (4 bunk beds was too much for our room), no en suite bathrooms in rooms - I had to walk around the hallways at night in my pyjamas in front of loads of strangers to go to the toilet which I found a bit weird, we had breakfast at 9.15am and everything was pretty much gone so we had to check out with empty stomachs. All very minor things really, overall stay was nice, but would not stay for more than 1 night.
The cost, the location, the staff, the hostel itself, the common area, the overall vibe. I had a hospital appointment in St. Vincent's Hospital early in the morning, so we stayed in Dublin overnight so we could get up and hop on the DART and not rush as we're not from the Dublin area and would be awkward for us to be there early from where we live, so we just needed somewhere to rest our heads for the night before the early start. Nice overnight experience.