Avalon House

With beds in a share rooms from 15 euros per night, Avalon House is one of the cheapest hostels in an expensive city. Another good point is that it's on Aungier Street, behind St Patrick's Cathedral and not far from the medieval area. Nightlife is a bit further away, but you shouldn't take more than 20 minutes to get there on foot. To get there from the airport, it's best to take the 16A bus (2euros) which leaves you next to the hostel. It takes about an hour. Prices include wi-fi and a computer if you did not bring your own laptop. In total, nearly 300 people can stay there in the single, double and shared rooms.