What conditions must I fulfill to subscribe to a SwissCaution rental guarantee?

• Minimum age of 18 years.
• At least one tenant must be a Swiss citizen or have a B, C, or F residence permit. For G, L, N, and S permits, as well as Schengen Area nationals without a residence permit, an employment contract with a minimum duration of 12 months is required.
• A good credit rating.
• A residential lease with a minimum duration of three months for an apartment in Switzerland.