Only a few days till I'm in Berlin. Decided I'm going to couch surf or a get a room in a Hostel for my first couple of nights until I find a more permanent spot in a flat. Shouldn't take too long. I've made some contacts with potential roommates, we all just want to meet for coffee or a beer to be sure we'll get along.
So, anything I should no about getting a room in a hostel? Do you need to reserve a spot ahead of time, or can you just go in an ask for something? Could I reserve a room for two nights and extend it if I need more?
I know I'll probably be sharing a room with a few other people. I am not planning to leave my computer unattended.

