After a leisurely three-hour stroll, Tatyana and I returned late last night to 6 rue des Arquebusiers. Alas, the micro-battery door opener wasn’t working, and I couldn’t find the door code on my iPhone notepad. So I called Gleb, sitting in our fourth-floor residence, for the door code or to otherwise let us in. 15 seconds later a folded piece of parchment flitted down from above. The door code was written on it. We ran into Gleb on our way upstairs and learned that he hadn’t written the note. The author was some English-speaking building resident who had heard me explain the situation, etc. Thanks, neighbor.