Does anyone know what hostel that is in the photo?
Well, there is one good thing about internet and creative common pictures but the pics are from three different locations:
The first one is from Ben's stag weekend, and most probably it is about a bar, not a hostel. The hostel rather seems that hut on the countryside, where they made that pork BBQ for Ben's birthday. According to the tags, it's possibly Lincoln or in Lincolnshire. Uktrail could be able to recognize it and may have been there as he knows British hostels more than his own palm! :)
The second picture is from a concert tour and the hostel is probably from Luzerne, Switzerland.
The third picture is from the Generator Hostel in Berlin. ;)
I've seen it personally so at least I can prove that!