Niccea
But I'm hoping those guys are visiting the other apartments.
I reason that it's not so bad at all if you can't see them.
Think about it-
Cockroaches feed on rotting mater of various sorts. Also paper, clothes made of organic fibre, feathers, leather, fur etc but not so much really.
If you've got roaches, most likely there's some damp, rotting source of food for them somewhere, They're basically doing you a service by cleaning that up. If it wasn't for them feeding on that mess it'd get worse and stink up your place ;)
If you can get rid of anything in your place that's damp and icky, and seal off all entrances
FROM damp and icky areas, as well as not have anywhere where crumbs can gather etc then most likely roaches won't come in so much, if at all.
It's not killing them that makes a difference, it's taking away their ideal environment that counts.
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that said I don't get roaches here in winter, but in summer with the doors open at night they can sometimes wonder in- their natural environment is living in leaf mould, feeding on rotting vegetation. Any I see I kill… There's no way I'd bother trying to eradicate them from wherever they might breed in the garden. As long as there's no were for them in the house I'm not too bothered.
As for rats, they breed in the trees and things. My cat hunts them. They don't come into the house. There's lots of tasty bugs and lizards for them outside anyway. There's never any snakes.
-Just a note on cats and snakes: Cats tend to be very resilient to most snake vemom. Dogs aren't though, so be careful of your pets.