Yes, if you're a consumer account, the deposit amount Poppins suggests is just a starting point. You're free to change it to any of the available options: €0 (no deposit), €50, €100, €200 or €500. You'll find this in your listing settings, under rental options.
If you're a professional partner, the deposit is calculated automatically. In some cases it can be adjusted manually.
Contact support@wearepoppins.com for support or any questions.