Pretty good! We liked our stay and overall were pretty happy with it. Some points for future travelers:
Pros: Very central location, travel crib available for baby (great if traveling far and don't want to carry one), good communication from host, nice pamphlets of information about Dublin in the flat, super transfer service with David McDermott (I recommend so highly, and his private tour was phenomenal!!), washer and dryer which were very helpful when traveling with a baby.
Cons: the building smells terribly of trash because of where tenants' trash is stored--not the best way to be greeted on every entrance, the property is managed by a company and you deal with several people so feels more like a hotel and less like an AirBnB, not much space in flat to store things (we had to put our suitcases on the couch), very tough to manage the temperature--either very hot from heater or too cold without.