For neighborhood-radius consumer services, cleaners, handymen, pet care, landscaping, Nextdoor punches above its size, because its recommendation threads ('anyone know a good…') are purchase decisions happening in public. A free business page plus a habit of being recommendable there costs nothing.
Its ads are secondary: hyper-local awareness at modest budgets, worth a test only after search is working. The organic recommendation dynamic is the actual asset.
The way to win it isn't posting. It's being RECOMMENDED: delighted customers mention you when neighbors ask, and you can ethically nudge that the same way you ask for reviews. B2B and metro-wide businesses can skip Nextdoor without loss.