The three of us had a great stay at The Blue Light! The flat being part of the family business with the pub downstairs, and the whole family were really welcoming to us.
The view over Dublin was great, and this is also a good location if you plan to roam around Ireland - which we did. Our stay for three nights were to hike the highest mountain of both Ireland and Northern Ireland, and as such we more or less spent only late evenings and nights at the flat. The kitchen at the pub stayed open longer just to cater for us - great service indeed! Standards, cleenness and service was all perfect. Upon our late arrival, Clodagh had shopped for the fridge, and we found a nice bottle of white wine - thanks!
We had a rented car, so did not use any public transport. We noticed that the car park on the premises were used as a starting point for hikers roaming the countryside nearby.
One should of course be aware that the flat is on top of a popular pub, but we hardly noticed any noice from downstairs. We slept well in our beds!