Pantry: unlikely with a full sized window and beautiful wood ceiling. Otherwise that might make sense. It's hard to tell what happened there though as the previous owners split up said room into a hallway and bathroom.

To make things even more complicated: the house actually only has 4 rooms side by side. Large room, kitchen and two smaller rooms. According to a local whose aunt lived in the house in the 1950s and 60s the place wassplit into two units of two rooms (kitchen + bedroom) each with seperate entrances from the street.
However, the back two rooms were not connected until 1976... one of them only had a door into the back yard. The other of the two has an old door leading into the kithen - which supposedly belonged to the other unit... weird. Just weird. Oh, and the ingenious light swtich and socket would have ended up in different units according to his description - but it must have been installed while the place was split up... no idea what actually happened there.