I have been quietly following the thread and wonder why apparently everyone here sees the loan amount of 755k€ with a monthly net income of just under 5700€ so uncritically. The repayment rate is naturally "only" 2000€ (already more than a third), but then there are still the additional costs and the savings amount for maintenance. These cost factors are also missing in the calculation of the OP a few pages earlier. If you deduct these costs, then it is no longer 2000€ left for the OP and his family to live on, rather around 1500€ (roughly estimated).
Children do not get cheaper as they grow older and a second child is supposed to come as well. When the wife then goes on parental leave, she might get ~400€ parental allowance, so again less. Whether it is then still possible to set aside money for emergencies, the so-called emergency fund, for special repayments, let alone for vacations, I don’t know.
I have seen more stable financings in this forum that were evaluated more critically and the questioners were rather discouraged from buying. Here, however, almost everyone seems to agree that this construct works. Or am I overlooking something serious?