At this point in the strip, I don’t think I had quite figured out the housing situation for Naomi and Charlie. This scene must take place in Charlie’s apartment, as evidenced by the peephole and the fire escape plan visible on the wall. The map of “Naomi Thatcher’s London” printed in the back of Sick Sense of Melody reveals that Charlie and his brother Dave share an apartment on Baker Street (much like Sherlock Holmes and Dr. Watson, save in Canada rather than England – ironic now that I consider that Charlie and Dave’s surname is Watson).
Panel 4 illustrates just how less stoic Charlie was in the early days of the series.
Cartoon Graveyard 