5 * Hotels in Dublin?

Hi! I searched all over the net for five star hotels in Dublin and came results: Merrion Hotel and Westbury Hotel. If anyone had been to any of these hotels, especially the first one, please post some suggestions. I don't mind to pay extra if I know that I will get class service on time. If anyone has information about some other five star hotel in Dublin, post it here!

We just returned from a wonderful 4-night stay at the understated but charming Merrion Hotel. We paid 365 Euros/night ($494/night due to the poor exchange rate), which included a full Irish breakfast and special herbal tea. We stayed in a Garden Wing Deluxe King room which had a view of the lovely gardens. The room was about 330 square feet! That is definitely most beautiful five star hotel I have ever seen!