If you're after a simple pied a terre in the centre of Dublin, The Earl Hotel Leeson Street, Sonder, is cetainly recommended. That said, the emphasis is on "simple": the rooms are clean and neat, but quiet small, and there is no lift to get you to those on the upper floors. The venue is pretty much "room only", so you'll need to find food somewhere else (hardly a major endeavour, given the location). Underlining that is the price: you'll be paying to be in the centre of Dublin, so the price can feel much higher than the room should command.