I've stayed in my fair share of backpackers over the last 7 months or so, so thought I'd put up a bit of a review of some of them.
Brisbane - Bunk (8/10)
$12 a night, can't really go wrong, in terms of value for money this place is about as good as it gets, decent location, only a 5 minute walk from the Brisbane CBD, and its right in the heart of Fortitude Valley.
Melbourne - Flinders Station Backpackers (7/10)
Pretty cheap and basic, not the best place going around, but it has a cracking bar and is in a brilliant location.
Melbourne - YHA (7.5/10)
Decent enough, facilities better than most backpackers going around.
Kuala Lumpur, Malaysia - Sunshine Bedz (6/10)
Good location, security is pretty well non existent though, the no shoe policy is a bit of an odd one though.
Porto, Potugal - Magnolia Porto Hostel (7/10)
Very helpful staff, quiet place in a decent location.
Madrid, Spain - Way Hostel (6/10)
Very busy place, in a bit of a dead part of Madrid though, pretty good activities offered to guests though.
San Antonio, Ibiza, Spain - Hostal Marino (9.5/10)
More like a hotel, probably the best hostel I've ever stayed in, 5 minute walk to all the bars in the west end, and very friendly staff, brilliant food in the bar too.
Barcelona, Spain - Itaca Hostel (4/10)
Pretty ordinary, showers are crap, but the place is pretty close to La Rambla and all the fun that comes with it.
Brussels, Belgium - Sleep Well (7/10)
More of a hotel, price shows that though.
Luxembourg City, Luxembourg - Luxembourg City Hostel (7/10)
Location is a little bit of a hike, literally, but the place is pretty good, pretty decent nightlife complex nearby.
Edinburgh, Scotland - Royal Mile Hostel (8/10)
Plenty of pubs nearby, right near Edinburgh Castle, pretty good amount of privacy too, even in a 12 bed dorm.
Glasgow, Scotland - Euro Hostel (8/10)
Well worth what it cost, the alcohol vending machine is a big plus considering you can't buy booze after 10pm in Glasgow too.
Newcastle, England - Albatross (7.5/10)
Good value, Yates pub straight across the road, and pretty close to everything else as well, in a good spot for nightlife too.
Liverpool, England - Hatters Hostel (9/10)
Quality place, room was very affordable and was like a 2 bedroom apartment, better than a lot of hotels I've stayed in, pretty close to things as well.
Belfast, Northern Ireland - Global Village (4/10)
Nowhere near enough facilities for the number of people staying here.
Dublin, Ireland - Barnacles Temple Bar House (8/10)
Great location, right amongst all the pubs, some of the rooms even have private balcony's.
Feel free to add some of your own reviews of hostels you've stayed in.