We had an excellent 3 night stay at the Waterloo House. We reserved the family room for my husband, myself and our two adult children. The room fit the four of us comfortably. The beds were comfortable, the room was free from street noise and the breakfasts were excellent. The neighborhood is charming and our hostess recommended a very good Mediterranean restaurant, Keshk, just a block or two away.
I feel like I do have to weigh in on the distance from city center conversation that appeared in the reviews that I read while I was researching where to stay in Dublin. It is a 15 - 20 minute walk to Saint Stephen's Green - which is the outside of the city center - from Waterloo. While we were there the weather was perfect and in the mornings the walk didn't seem that bad. In the evenings, coming home from a long day of site seeing the walk seemed a lot longer. Again, we had great weather. If it had been pouring rain, the walk back in the evenings could have been miserable. Our hostess recommended the hop on, hop off bus tours that you can catch at Saint Stephen's Green. I usually never do these but it was well worth it. I would recommend the hop on bus tours and hoofing it over trying to drive and park in Dublin.