The location is perfect! We were there with two young children. We were close to the train, one of the Hop On, Hop Off bus stops, several yummy restaurants within walking distance, a fresh supermarket nearby, several cafes, and maybe most importantly, very close to a simple play area that took up a chunk of our time everyday.
Pay close attention to the information Liam sends you on how to retrieve keys to the apartment! Otherwise, you could be walking around and around in circles like me. (All my fault!) Perhaps not as important is printing out the tourist information; there is a copy in the apartment.
We really enjoyed our time in Dublin and wouldn't hesitate to book Liam's apartment again!