Looks good! Regarding the amount of the installment, all I can say is: Depending on how "strict" you are about saving / investing in general, you choose the amount of the installment. As low as possible, as high as necessary, I would say.
There are 2 different types of people (not black or white, but just to make my point clear)
A) Person A chooses a high monthly installment (e.g. 1,700 euros) to the bank in order to achieve as high a "forced savings effect" as possible. Wealth building works through the high agreed repayment of the house.
B) Person B chooses a low installment (e.g. 1,400 euros) which is still reasonable in the current interest rate environment (at least 2% repayment) and "saves" 300 euros compared to A in the given example. Important: B MUST also save / put aside / invest the 300 euros in order to achieve the same amount of saving performance as A. But B is so stable in his personality that he does not consume the 300 euros, but invests them profitably because he believes he can achieve a higher interest rate with the 300 euros than the interest rate on the mortgage loan. Caution: If he only puts the 300 euros into the daily allowance at 0.01% interest, this is NOT a higher interest rate than on the mortgage loan: Here, A's approach would be better.
Where do you stand?