The Generator is located right at Hamburg Hauptbahnhof, it's really nice to stay somewhere central. The bathroom was tiny and the breakfast (additional 5,50€) was not worth the money, but the room was good, staff was really nice and helpful.
The hostel was okay, but I really didn't like the bottom beds, they are so low that you cannot sit on your bed and also there are no bedlights. The atmosphere was more uncomfortable then expected. Most likely because there were only old guys staying in the hostel who were trying to have a creepy conversation with you in the common area. The common area also is not comfortable, because it's a really big, cold, stone-walled room with an endless high ceiling (like an old church building).
I really liked to stay at this hostel, because it has a really nice atmosphere! It's really clean and the staff takes good care about everything! The room I stayed in was quite small, but therefore the common areas are big (the lounge area with a big, modern kitchen and the rooftop - awesome!). The bathrooms all are really modern and what is more important, really clean! The breakfast is very good and until (!!!) 1pm, that gives you the chance to party, sleep in and still get breakfast :)