The apartment itself was lovely - really clean and sunny with one of the comfiest beds I've ever experienced. The building was nice and quiet, and very secure with many layers of locked doors (not that Dublin is dangerous). Only issues were the hot water heater doesn't work except a few hours a day, early in the morning and late at night, which is really frustrating. I was also a little disappointed at inflexible checkin times despite it being self-checkin and there seeming to be like a team of people managing this property. My flight arrived very early and I had to wander around jet lagged and half conscious for 7 hours before getting into the place and being able to nap. I'm sure guests would appreciate a little negotiation there, although that is also my fault for not looking for a listing with a flexible checkin time.
That said, if you find yourself with that amount of time to kill, the apt is like 2 blocks from the Chester Beatty Library which is an amazing museum, right next to Dublin Castle, and the Sandeman's free walking tours leave from about 5 min from there. It's also about a 10 min stroll to Temple Bar.
Really, aside from those 2 issues it was perfect and neither was a deal killer. I do hope to be able to stay here again next year when I come back.