@dadpad,
http://sv.wikipedia.org/wiki/Bryggen_i_Bergen
It is easier to see the houses this way than sideways.
I see there are two windows a large space and one window. As I never have seen the houses from inside I would guess there is a staircase and a corridor, which runs into the wall we can see and a room with two windows and a room with one window. at each side of the corridor.
With four windows I would guess the corridor runs in the same direction as the wall we can see.
I don´t know what Bryggen looked like in the middleages, but in Sweden - and not only there - the houses were 7-8 meters broad and up to 30-40 meters deep.
Where I come from many of the houses had grass roofs. During a state of siege the domestic animals grassed on the roofs.