2 friends and I stayed there last weekend. Very very close to the city centre, free car park, breakfast was excellent and the staff really friendly.
Our (triple) room (#3) was spacious and clean : all that was needed to complete a nice weekend with friends in Kilkenny.
It is an old hotel with a lot of character. Don't expect a brand new building like the Hilton ; however it's more than enough as a base.
The only disadvantage I can think of for some people would be the stairs.