The staff here were quite friendly. The internet worked. The beds were pretty comfortable.
The main thing I didn't like was that the lockers for your belongings are downstairs and the rooms are upstairs. If you want to keep an eye on your stuff, you'll be running hither and yon to keep track of everything. I've seen too many hostel thefts to leave my stuff lying around, though everyone staying there while I was there were nice. Still, I was never asked to show my passport here, and you can't be too sure who else is around -- I can only assume the other travelers weren't asked to show ID either.
Also, the idea of being green is very nice, but it comes at the general expense of comfort in the common areas. Benches and tables are made from refuse so they are wobbly and you may feel like a small child trying to reach your keyboard if you home to work at the tables.
I have to say, though, that the location is terrific and the value is the best I found in Montevideo. The people on staff were all very friendly and laid back, eager to help with any questions. I found my stay there pleasant, if a little rough around the edges.