The lower the interest rate, the higher the initial repayment should be. A repayment rate of at least two percent is recommended in any case in order to be paid off within a manageable time frame - but three or four percent is better. In this way, the total term of the loan can be reduced to around 20 to 30 years. You should also allow yourself the right to make unscheduled repayments during the term of the loan agreement.