This can be very effective, but pissing off your landleech is not without its risks.

More generally I might suggest learning your rights. If you live in the US, I might suggest Nolo Press’ website and books. Depending on where you live, you may be able to fully or partially withhold rent for failures to repair.

I don’t have much personal experience with this, but getting to know your co-tenants may also be useful. If you take this idea far enough, you may even be able to work as a bloc: https://en.wikipedia.org/wiki/Tenants_union