It would certainly be possible and we could probably afford it, but we just don’t "dare" to because children are planned. I have been keeping a very meticulous household budget for years and know which items we could also cut back on. We have a very expensive hobby and like to travel now and then; that will be less with the house, but we’d rather use the special repayment option than overextend ourselves or restrict ourselves too much.
I can well understand that, children do bring quite a lot of additional costs (one-off costs like a stroller and of course ongoing expenses), and in the income bracket you’re in, in my opinion, it’s definitely okay to repay a loan without restrictions on hobbies and vacations.
However, I would still recommend a loan with a lot of flexibility in the repayment rate, because at the end of the day, by making higher repayments especially in the early phase (when the children might not yet be there), you save many thousands of euros over the term. With flexible repayments plus special repayments, you have all the levers. We are glad we did it that way and can always readjust now (for example: daycare costs decrease from under 3 years to over 3 years - we simply put the difference into the rate).