"I stumble down the stairs, unheard, unseen,
one tiny wheel inside a great machine"

That line is brilliant. Nice use of repitition and flow. I feel you chose an appropriate length for this, and painted a very real and see-able scene. I can't even find something I would change, besides perhaps single-spacing the text (hold down shift when you press enter for each new line to eliminate the double spacing--pardon me if you know this already, for I only just learned it). :)

Added to my favorites.

I love good vilanells! The repetitions describe well this endless flood of people. The come in waves, so there is even a certain rhythm, a good observation!