Since then the staircase has turned up in two more of Durand's Onésime films:
If this is the same place, then the staircase must have been remodelled. If the plan parcellaire of this place, drawn no later than 1896, is to be believed, the staircase linking the rue des Lilas and the boulevard Sérurier was originally straight:
He does have one painting called a Staircase in Belleville, dating from the late 1920s:
If it is a different staircase, I haven't found it yet.
Another staircase painted by Quizet poses a different problem:
If I get to be any more definite about either the staircase in the Gaumont film or the staircase(s) painted by Quizet, I shall post again.