We booked 2 rooms at the Fitzwilliam for our stay in Oct 2012. (3 nights)
Staff were really friendly at check in and concierge was also helpful with tips for our time in Dublin.
I was very pleased with the rooms, one of which had a balcony that overlooked the park - it was nice to sit out there and watch the world go by. The rooms were spacious and stylish, bathrooms also very nice and newly decorated.
Location was fantastic. Right on the to of Grafton St, and opposite the park. We strolled through the park many times, it was lovely.
Did not eat at the hotel, so cant comment on that.
Would stay here again and would reccomend to friends.