Since this is the first youth hostel I've ever stayed at, I'm not really qualified to comment on how good it is. However, from what I've heard about youth hostels, I had pretty low expectations; and Hostel Amigo easily surpassed those expectations.
Rooms: clean, quiet, comfortable.
People: friendly mix from all over the world, including plenty of Aussies.
Staff: friendly and English-speaking.
Location: central but safe.
Food: nice free breakfast.
Perks: free, unlimited Internet! (only 3 PCs, though). Also organised tours, and cable TV and a pool table.