I would greatly recommend staying at Tony's place. It is midway from the airport and the city, and you can easily get to the center of Dublin through the DART, which is frequent and fast. As for the house, it is in a very quiet neighborhood, and Tony will treat you like family, letting you borrow everything you could need. The place in itself is clean, well furnished and the bed was confortable. In short, go for it, you won't regret a thing !