My sister and I loved our stay at Grace and Niall's. It's clean and comfortable and very pretty, and just the right size for two people. The neighborhood is ideal, quiet and removed from the city centre but within easy reach via the #1 Sandymount bus. (Tip: buy a Leap card for unlimited passage on city buses and on DART, the commuter train.)
Grace and Niall were very prompt and responsive with communication.
As caffeine-head Americans, we missed having a regular coffee maker, but we did appreciate the Nespresso machine. We also appreciated the nearness of a Tesco grocery and the Merry Cobbler pub. Have the fish and chips with mushy peas there. You won't be sorry.
If ever we return to Dublin -- and I certainly hope to do so -- I hope to stay here again.