Inn of the Liffey is ideal for a couple of nights away. Although fairly basic, it was clean, the staff were friendly and the location was fantastic (just a few mins walk from the Ha'penny Bridge & Temple Bar). The breakfast was also great.
Only tiny criticism I have was there was no lift, and we were based on the very top floor - so was hard work after a long night in Dublin's pubs.. :)
Would definitely recommend & return on my next trip to Dublin.