Cecil S. covered the highlights of staying at the Times Hostel, and so I'll just add a few things…read morein addition.
I stayed there in August while apartment-hunting for the fall. My trip didn't go as planned; I ended up in Dublin a day later than expected (I sent them an email to let them know, and they were very gracious. I had to pay for that missed night, but I knew that ahead and confirmed in my message that I just wanted to confirm my second night.) When I checked in, I received a warm welcome and some basic help to get me started on a fast race to try to find a place to live.
The room I booked had room for 4 people (mixed), and three of us made it there for the night. The bathroom was en-suite, and all was clean and cheerful. Well-laundered, comfortable linens are provided, and you can rent a towel if you don't bring your own. Downstairs, the (slow but cheap to rent) computers are still there, you can pay for the use of laundry, and you can arrange to use a guitar or leave your luggage for the day. All of this is done through the front desk. The kitchen areas are very open, and when I was there, people used them extensively. People can label and keep food in 2 dedicated refrigerators, and if they have something leftover, there is a spot in one 'frige for food to be shared/taken. Need milk for the free coffee/tea/hot chocolate (Cadbury's) available all day? Help yourself-there's a dedicated spot for that, too.
There's a nice mix of people who stay at this hostel, which has an arrangement with a local language school. Therefore, some people were staying long-term and knew a little more about the city, and some people were just passing through. Dinner times and evenings in the lounge/dining areas were casual and very friendly. Due to my delay in getting to Ireland, I'd picked up a couple of novels (I know, how old-fashioned!) that I'd read, and so I took advantage of the book swap case to leave a few and take a new one.
It's touches like the bookcase, the open but tidy atmosphere, and the great staff that make a difference here, I believe. I wouldn't hesitate to stay here again, and in fact, if my niece visits, I'll try to convince her to stay here for a night or two just for a good experience.
Getting there from the airport: I took the #16 bus, which stops a block or less from the hostel and at under 3 euro, saves about 20 euro over taking a taxi.