Pros (+) The common kitchen area: it's inviting and well equiped. The 24 hr staff are very helpful and I liked that music streamed in through the open windows at night. Good place to sit and interact with other guests. The location makes all of Edinburgh very accessable.
Cons (-) I had a top tier bunk, so two people slept below me and there wasn't much head space left. Shower and bathroom facilities are small and universally shared. Both of these are fine as long as you expect them coming in.