It's this place - Notre Dame de la Croix, off Rue de Menilmonmant
There's a plaque outside explaining all the history, albeit in French.
I'd forgotten - there square in front is called Place du Maurice Chevalier!
Lovely spot.
My local bar, the Petanque, is there - not worth travelling out of your way for, but friendly barman (rare!), locals, and only holds about 10 people. Very retro place.
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There's a little