Private leasing with negative interest

I have a private lease offer that looks like this: rental special 14500 total loan amount 14300 residual value 2900 monthly lease rate 206 nominal interest -16.75% effective annual interest -15.5 total akker payments 24700 5000 km per year I have a whole range of questions: 1. Are there any other hidden costs that I have to pay at the end of the lease period? 2. Is the stated residual price a fixed residual price or an estimated price? 3. I know that I have the car after 36 months Can the leasing company refuse me the sale of the car at the remaining price? 4. If I know that I keep the car after 3 years, can I drive more than 5000 km per year, as stated in the leasing agreement? What other factors should I consider when deciding on this leasing offer?