I stayed in this hostel because I went to the Lollapalooza and it was very close to the Parque O'higgins. It was also very close to the public transport, so you can get there very easily.
The hostel is only two blocks from the train station. It's really quiet (I liked it), i think that it's according to the city. The bedroom was clean (also the bathrooms) and the bed very comfortable. I think that the breakfast is a bit expensive (CHF 7 per day) but the entire city is expensive. There was wi-fi everywhere in the hostel. You can purchase your own food in the supermarket and cook in the hostel kitchen (it was very big space) and there were plenty of tables to eat.
The hostel was perfect. You has a great view of the edinburgh castle (lees than 100 m.). The hostel has plenty of common areas and bathrooms. The only thing I didn't like: my bed was full of hair (of any kind), as if the suerte had not been changed. Apart from this, the hostel was excellent.
You pay for the location, only. It's at 2 blocks from London Bridge. If you like party, there is a bar just in the ground floor (at night, the noise enters through the rooms' windows). The staff was useless. Only 1 of 5 of them knew the answer for my questions. Do the web check-in only if you want to save the deposit for the key card (you will have to wait at the reception anyway. It's my 2nd time there (1st in '09) and somethings are better, like lockers, showers and breakfast (same building)
The rooms and lockers are big (mine was for 6). The breakfast was very good (you have to pay 1 or 2 eur per day). It's in a quiet block but at 2 or 3 blocks from the centre and 2 from the metro. The best hostel I ever been.
I did not stay in the hostel.
The hostel is very good. The staff is excellent, very helpful. It's very well located (near to Union Station). It's a bit noisy at night, but if you like to go out at night, you'll like this place.
The staff was very helpful, but one of the girls was always very insistent to go out at night. The room is cleaned every day. You have free wi-fi in the common room (you have to pay if you want it in your room). There is no elevators (I was in the 3rd floor), but you can leave your biggest baggage in the first floor (near to the reception).