would you consider having it in the UCI in coolock. Have brought my 2 yr old there for parties twice in the last 3 months and I thought it better then other places of similar ilk. Big enclosed play area, food and drink, and a big barney type dinosaur that goes round and keeps the kids happy. You pay per head and no cleaning up after. If you want to have it in the house, try mr balloon man, number in the book, he seems to be the man for such occasions according to a friend.
Note: I have no relation to mr balloon man or the UCI dinosaur.