I would argue that clutter in your apartment does not "affect[] the health and safety of [you] and [your] neighbors." At most, it affects your safety.

Here's the thing...you can either unclutter the room or metaphorically flip your landlord the finger and see what happens. If there is a high demand for 2-bedroom apartments where you live, then the landlord might actually try to evict you. If I were you, I'd find a less obnoxious landlord at the first available opportunity.