Sarphati Park is a hidden gem. Check out the open air markets on Albert Cuyp (?) straat. Katsu is a coffee shop filled with locals. If you want to learn how locals live, but still be within walking distance of city center, stay here. Rembrandtplein is hopping at night, Waterlooplein is an open air market where you can get sweaters for 2 euro. Rooms here are tiny, but few stairs. Chill lounge. Plumbing is below average, but so are room prices. I'd stay here again.
Coffeeshop atmosphere in the lounge, open 'til 3. Breakfast is toast and hard boiled eggs. I've stayed in 3 hostels in Amdam, including about 2 weeks at Bob's. Bob's beats the rest. Book the 16 bed female dorm - almost no stairs. Locked luggage room, enormous lockers in room and enough for everyone. Very clean. Separate toilet, shower, and sinks so you don't have to wait. Walking distance to Centraal station. Best coffeeshops nearby: the Doors (also serves beer), 420 Cafe, Homegrown, Abraxis.
Hostel bar is awesome. Breakfast is above average - wide variety of breads and such. No dry place to put your clothes while showering. Dorm rooms are a decent size but feel small. 4 beds in mine, plus table and chairs. I woke up my roommates when I checked in at 9 pm. Very close to a tram stop, so easy to access. Located down an otherwise empty street. Looks sketchy at night, but plenty of people around during the day. The maps here (made my locals) are priceless.
SO MANY STAIRS. You can use their microwave to make your own food. Cool people chilling in the lounge. Luggage room, staff actually pays attention to who's taking what luggage in there. Dorm rooms are cool to chill in. Leidseplein is a great place to stay - many bars, restaurants, coffee shops, easy walk to anywhere. Check out Rookies, and make sure you get pancakes across the street from the hostel. Bathroom is less than ideal: shared toilet and shower, shower spills water on floor.
Take the tour to Glendalough. I'm not a bus tour person, but it was well worth it. You won't see those views if you go by yourself. Shuttle to the airport is awesome, but remember everyone in your room is there for it, too. So someone's alarm goes off every hour, starting at 5 am. No wifi in room. Met good travelers here, close walk to Temple Bar, grocery store, cheap pizza. No lockers in room, lockers in the common room are tiny. Had hot water.
The pub crawl was excellent. As a solo traveler, it was nice to have not only someone to show me the pubs in Dublin, but also other people to spend part of the night with. Lockers are in the basement (no elevator). 2 euros per day, plus 10 euro deposit. I left my stuff in my room since it was only one night. One guy used a bike chain to lock his suitcase to his bed. Breakfast in the morning (7:30-9:30) is corn flakes, bread, and beverages. I came for the pub crawl, was not disappointed.
Great location, easy to walk or take a bus to anywhere in the city. Also many fine restaurants and shopping places nearby - you can get anything in the university center. It's also really easy to meet people here to do things together, like the Black Taxi Tours or going to pubs. Quiet starts at 12 am, but if you're not keeping people, you can stay up later talking outside of your room. Definitely check out their other hostel, Finn McCool's at the Giant's Causeway. Same service, excellent view.