Personally... i dont like this dungeon, its kinda boring and the xp isnt all that great. Ill get back to that.
Aight... here are the simplest direction i can give you.
There is a guard tower north of Howth. Go behind that guard tower and go west over the hill. Once you are at the bottom of the hill, turn right and you should see the den. It looks like a giant rock.
Groupwise, a healer is a must. Perferably a druid at this point, but im a little biased ;-) Anyway, have a tank and a couple of casters and you should be golden. Tank is there pretty much to pull aggro off your casters or healer.
Be aware, some of these mobs BAF. Actually, several do. Be on standby for someone to root incase too many come.
Also, there is a named mob in a part of the dungeon named Tabor. He looksn like a giant sprag. He was red to me @ 23. Be careful, when he dies, his ghost comes and he con grape to me and hit with some nice spells. Be careful