I've never seen such a interesting hostel, with many buses and trains turned into fashionable rooms, especially at night, the atmosphere was amazing with color lights and nice music. The staff was friendly and of course, perfect English. Only 10 min by train to the center of Bonn, and on the way to the station, you can have nice meals in those restaurants around there. The space between two bunk beds was a little low so it was a little bit hard for my big companion, but for me it was perfect.
If I stayed there during the time they had events, it would be even greater!