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'