Are the conditions for purchasing a property good?

I consider that feasible. Until parental leave, you can still save up some buffer. However, I would not expect both to work full-time again after one year. More likely, one will reduce to 75%. But that also depends on the possibilities of childcare. If the salary at least includes the inflation adjustment as an annual increase, then the share of the annuity in the income will gradually decrease, so the situation will also relax somewhat. The really big leaps around it might not be possible, but it should work. Apart from general life risks.

Generally speaking, there is also a difference between spending 40% of €6k per month on housing – then you still have €3600 left for the rest – or 40% of €3500 – then you would have to cover everything else from €2100.