I really enjoyed staying at Mary's home. It has a peaceful, homely feel with modern amenities.
The locality is great. Many good restaurants and cafes literally around the corner and 3 food stores.
The LUAS rapid rail stop into the city centre is only 5 mins walk away and takes about 10 mins.
Mary is a tour guide so knows Dublin and Ireland well.
I highly recommend Mary's as a place to stay when in Dublin.