I've also used City West City Kennels (01 4583602). I've no idea whether they're good or not but our mutt was given back to us in one piece, albeit a bit freaked out for a couple of days (more to do with separation from his 'pack' than the kennels I suspect).
One word of warning though, book well ahead, espeacially for Christmas or other holiday periods (I suspect its too late to book most kennels for Christmas at this stage).
I use Fircroft kennels in Rathangan all the time - I live in west dublin and it is well worth the trip - I have 2 dogs one of them has health problems and oin special diet etc etc and Fircroft look after her really well.