I loved Isaacs Hostel. It was definitely the best hostel we stayed in in Dublin. The common area is big and has several large tables, which is great if you're on your computer, eating, or starting up a conversation with some new people. Staff were helpful and nice- we got some great pub suggestions. Breakfast could have been better - cornflakes, toast, juice and coffee, but there's a Tesco basically across the street. Beds are comfy & bathrooms are clean! One of the best hostel's I've stayed in!