I found the write-ups here helpful before I visited Dublin for my recent outing - a group of us went over for a weekend a few weeks ago. We were aware rooms could be pricey, but we found a great hostel about a mile from the city called Morehampton House. It's a massive Georgian and not much of a walk to the centre, but most of all it's great value. We only paid 20 per night for each person, so I wanted to let those who want budget rooms to know about it. Its clean and friendly.
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