Close the door but don’t lock it ever. Same if 'er indoors is in. Only lock it if we have guests.
The bigger issue is that the hallway window gives a direct view of the landing between the bedrooms and the bathroom, and the neighbour’s hallway window looks into it from about 15 feet away. Try to nip* across the landing as quickly as possible but if the timing’s right then those poor bastards are going to see everything.
Although they have started leaving the curtains on that window permanently closed and they didn’t used to, so maybe it’s already happened.
*wheeeey