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. There is a cafe where they serve breakfast in the morning (included in the price), and that you can use throughout the day for drinks. There is also a pool table and a kitchen to prepare your food. The shared rooms are simple but clean, and the atmosphere is nice.
It's one of the most popular hostels in Dublin. They have offers of pints of Heineken and a Guinness-like black beer for 2.50 at the weekend, and you can get a burger made on the BBQ, too. The rooms have bunk beds, the bathrooms are outside, and the service is excellent. The reception has tables where you can eat breakfast, next to the kitchen, and there are also computers for the internet. The location is great, next to Busaras and Connolly Station. The only downside is that the noise from the train tracks might wake you up early.
The Citi Hostel is a hostel in the centre of Dublin, on a corner of Talbot Street, an area full of hotels. My Erasmus group and I used to stay at hostels during the weekend, as there was no public transport to take us home at night, and it was cheaper to stay in a hostel than get a taxi such a long way. A bed usually cost about 15 euros, cheaper if there were more of us. This time I think there were about 12 of us, and I can honestly say it was the crappiest place I've ever stayed.
The Spanish receptionist was friendly, which is a good point, but that was the only one. If you see the photo, there's a bench with a back patio and a cottage. Well, our room was upstairs in that little cottage, and luckily for the hostel, I didn't take any pictures. It had a dirt floor, dusty, with no curtains, and general filth. I'm not very fussy, but I found q-tips, empty bottles, etc ... disgusting. The bathrooms were even worse: dark, smelly, no toilet lid, no toilet paper, with hideous puddles on the seat. I close not to shower, because the bathroom made me want to throw up. I'll never come back here again.
Waking up early to be greeted by this view is just incredible! There's really nothing like it ... gazing out at the places that you'll discover in more detail later, then putting on a good, warm pair of socks and shoes, and going out into the world.