DUBLINNNNNNN!! <333 I was there last weekend, love it!! (jadore) Didn't stay in a B&B though, I like my nice hotels!! lol
We have stayed at the Jurys croke park for the past two years but we got deals on both occasions, try laterooms.com for the cheap options. The Arlington is the place to stay though, got its own nightclub and is next to the river.
get yer sen down to Bray far cheaper, and only £1.30 on the DART into Dublin, and the finest pub in Dub is O'donnaghues