Remember how every thirty households has a "community leader"? This person is called the phylarch, or in their ancient language, the syphogrant.
These leaders are in charge of electing a prince using a secret ballot. The prince rules for his whole life, but can be removed if people think he's a tyrant.
They have all kinds of open and democratic processes by which the prince deals with day-to-day business, and everything is conducted in the open so that the prince and his advisors don't do anything sneaky or oppressive.
Oh, and of course, the senate isn't allowed to debate something the same day it's brought up, since it's always better to have time to think things over.