"He falls down the stairs" sounds more natural in English.

He/She falls from the ladder or He/She falls down the stairs. (as kaphinga suggested)

If he falls from the stairs, I see a picture of perhaps some stairs going up to a building, which he falls off (sideways). If the sentence means that he falls down the stairs, it has to use "down."

i noticed the suggested correction to the english translation was left a month ago already. but to say 'he falls from the stairs' is somewhat unnatural sounding ...

's/he falls down the stairs', or 's/he falls off the ladder'

And if without THE? From some stairs ..