Yes, the entrance is in the side passageway under the arch. It connects at the back of the main pub too.
The building is spectacular: a wonderful grand staircase twisting up to the entrance and the room is spacious without being cavernous. Great views over Ha'penny Bridge.
The range is excellent: most of the Irish stuff you'd expect, plus Sierra Nevada and a few Belgians and Germans. Chimay White on tap, as well as the aforementioned Bernardus Wit. No cask yet, but it's planned for if it all works out. The manager is formerly of The Porterhouse in Temple Bar. He knows what he's doing.
The bad news: it's Temple Bar pricing. Pints start at €5.50 and go north from there. The Bernardus was over €8 (I was directed to Friar Weisse when I made my <!-- s:shock: --><img src="{SMILIES_PATH}/icon_eek.gif" alt=":shock:" title="Shocked" /><!-- s:shock: --> face).
There will be special offers and the like when they get down to the last few kegs of any beer that's not being renewed, but I reckon it'll be tough getting beer geek repeat business when The Porterhouse, Bull & Castle and Messrs Maguire are nearby and cheaper.