well i haven't stayed in the four seasons carlingford but i've gone in for a coffee, look around.
how they managed to get away with using the four seasons name i don't know - don't expect four seasons standards of location, hotel furnishings, service or style.
it's certainly a nice hotel - i'd call it good 3 star - there is a leisure centre which looks reasonable if overrun. we went in on a sunday afternoon and the place was thronged with people in the carvery for sunday lunch so it's obviously popular - but i wouldn't have called it a relaxing romantic valentine type experience.
not doing a downer on the hotel - just don't expect the US Four Seasons type hotel
my suggestion to you would be Castle Durrow in Laois - only 1 hour away from Dublin - quiet, relaxing, great rooms, great food and doing good deals at the mo (I have no affiliation but am biased as I have been there on a number of occasions including my own wedding reception!)