In a pan the film climbs the stairs that connect the rue Paul Albert with the rue Lamarck, finishing with a view of its tourist protagonists at the Hôtel 'A La Savoyarde':
Looking up from their hotel room they have a view of the Sacré Coeur :
Looking down they see the top of the staircase, and the woman that one of them has come to meet:
The stairs are still as they were, but the façade of the hotel has changed, it has lost its principal entrance, and it is no longer a hotel:
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Google Maps, May 2008
For the maps in this film, see here.

For the photography in this film, see here.
 
 
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I Vinti (Michelangelo Antonioni 1953)
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I Vinti (Michelangelo Antonioni 1953)
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I Vinti (Michelangelo Antonioni 1953)
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I Vinti (Michelangelo Antonioni 1953)
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I Vinti (Michelangelo Antonioni 1953)
The passage Cottin appears in its natural dilapidated state in Antonioni's film, made and set in 1953, but eleven years later, in Richard's film, it has to be cleaned up to represent the Paris of 1917:
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Mata Hari agent H.21 (Jean-Louis Richard 1964)
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Mata Hari agent H.21 (Jean-Louis Richard 1964)
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Mata Hari agent H.21 (Jean-Louis Richard 1964)
  
 
 
The pension where the protagonists live is in the place Emile Goudeau. It's now a TimHotel, and appears in Eric Rohmer's Les Rendez-vous de Paris (1995):
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François L'Henaff, Paris en marches
The same stairs appeared in Jean Renoir's La Chienne (1931):
For other stairs in La Chienne, see an earlier escalographe post, here.

In Leur Dernière Nuit, the school where the woman works is nearby, at the bottom of the stairs rue Paul Albert: 
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François L'Henaff, Paris en marches
 
 
 These look like these stairs in Renoir's La Chienne (1931), but there isn't enough readable detail to be sure:
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François L'Henaff, Paris en marches