This hostel does itself a major disservice by being so disgustingly filthy. Every surface of the place is dirty, floors sticky, walls & ceiling of bathroom covered in mold. The kitchen area where you eat breakfast is especially rank. One of the girl's bathrooms had three relatively new showers, but apparently the men's showers were pretty awful.
I stayed in a dorm with about 40 beds, but in general found it to be relatively easy to sleep, although the first night I was there by myself, and did feel a bit uncomfortable being a single female in what seemed like a room full of men! Each bunk bed has 2 lockers beside it (bring your own lock, or buy one at the front desk), and there's baggage storage at reception. You can also rent towels for 50p, linens are included. Free breakfast is cereal and toast. There's a piano outside the hostel bar (basically at the bottom of the main stairway), which is unfortunate for people who don't want to hear drunken piano-playing at 3am. There's also a fair bit of street noise at 3am when the bars close (although I was there during the Rugby World Cup, so there might have been more partiers than usual). The staff were pretty helpful - when my brother arrived in Edinburgh at 7am the morning after I got there, they let him check in and have breakfast even though they normally don't until after 10am. Honestly, you must have to be a saint to work in a place that dirty & gross!
The location is great, but I wouldn't stay here again if I could get another hostel. I'm usually not a complete stickler for cleanliness - I've stayed in nasty budget hotels all around Africa! - but the dirtiness of this place just permeated the whole experience. Oh, I also had a shirt stolen while I stayed here, but I try not to hold that against a hostel because visitors anywhere will do that sort of thing.