Jessica's hostel is a beautiful and cozy place to stay for a few days in Dublin. It was warm inside, which was nice because of the cold outside. The bedroom was worth the price it costed - not luxury, but enough if you are looking for a place to sleep or rest for a bit while you are a tourist. It should be highlighted that the location cannot be better (it's in the middle of the city centre, close to the touristic places, as well as buses / train lines...) which is something to take into account in a relatively big city as Dublin. The receptionist was really kind with us, and they give free breakfast from 9-10am, which is something to consider as well.
I highly recommend to stay in the Mulligan Hostel - if I go back, I would repeat for sure!