An Sibin is a great little pub/bar.  It's downstairs, so as you walk up you don't really know what you're getting yourself into, but like any Irish bar, as soon as you walk in you'll feel right at home.  It's somewhat small, rather cozy and very laid-back and welcoming.  The live music is great, hopefully you'll show up on a night when Yogi is playing, he's the best!  There are a couple other Irish bars in the area, but this one stays truest to the spirit of the real Irish pub.