Identify neutral and ground, when no color code is present
Easiest way to double check this before wiring anything, just open up another light/receptacle box, or even the switch. See what wire coloring the installer used throughout. Hopefully he stayed consistent. You could also open the panel and see what wire color terminates where.

If this is an individual occurrence, you should be able to see at least what was used for ground in the switch that's wired to this light. Even if the whole apartment wasn't done the same, this circuit might be.

It's a good place to start, let us know what you find.