This place is fantastic! We spent our day in Wicklow mountain hiking/sightseeing, and this castle was just such a cozy place to spend the night. Truly a unique experience in an incredibly cute part of Ireland. There's a woodburning fire stove to stay cozy and a kitchen to cook in.
The two things I'd flag for others is 1: there's no wi-fi (which is a good thing in retrospect, we could all use less time on our phones), and 2: there is no dryer (although there is a washer), so if you plan on using the washer just make sure you have time to dry your clothes (there is a drying rack).
But seriously, book this place! You will not have any regrets and you will get to feel like a queen/king for a day.