You won't really get finished with that. Starting from a monthly burden of 1500 euros, subtracting 300 to 400 euros for additional costs and reserves, the following picture emerges:
As you can see, this is probably calculated too optimistically. Of the 1500 euros, 1200 go towards repayment and interest, and that's with only 2% interest.
You will then pay off over 40 years. Ok, you might still plan for special payments. But that may not work out immediately with a new child(ren) at the beginning and just moving into the house. So that after 15 years of fixed interest, 288,000 euros of loan remains.
With the low interest rates, one should start with at least 2% repayment. That would then be a repayment rate of 1333 euros.