Opinions on the financing offer

Do not understand why an installment of 1060,- with a net income of 3500,- is called nonsensical

The installment may perhaps already match the income, just not the loan amount.

The problem is that after 10 years, with rising interest rates, an installment of €1500 may have to be paid.
That may then no longer match the income under certain circumstances.

Exactly, the rate would have to be much higher. But she probably can't do that, since there is still a loan being repaid, the amount of which we do not know.

The question was not whether "Markus1977" can afford it monthly, but whether the financial offer makes sense. And it clearly does not. Paying off more is always better – for the targeted loan amount, the repayment is too low. However, if a monthly additional payment is not possible for financial reasons – in this case due to another loan – a realist would consider the project failed.

Of course, one can choose the riskier option, but in the worst-case scenario, everything is gone afterward.

It remains the same: If you want to experience the last installment of the loan repayment, €500 per €100,000 loan must be paid monthly to the bank. (At least with the current interest rates)

Lower interest with the same percentage repayment always means: a higher remaining debt after the same number of repayment years. It is recommended to set a budget that is available monthly for payments to the bank and then see what this triggers in combination with interest and repayment. Depending on the offered interest rate, the term changes. If it then exceeds 30 years, it is almost inadvisable. If it is below, you can start playing with the numbers and include things like fixed interest period etc. in the consideration.

And note for a follow-up financing: Only the fixed interest period is the time during which you receive a binding statement of your performance/payment to the bank. The loan term after the fixed interest period, which you always see, is merely a fictitious projection.

Thank you for the answers, even if they are very critical. I would also share your opinion if I only looked at the facts of the financing in isolation. As I wrote, there are other circumstances that you have not taken into account here; instead, arguments are made with words like nonsensical and failed. The fact is also that certain things are added to the mentioned financing. 1. a 4-year-old condominium that will be paid off in 10 years, current value 220,000 euros 2. life insurance policies and pension insurances with a guaranteed 100,000 euros in the next few years, at the latest by retirement 3. inheritances, which I have consciously not mentioned so far because I do not want to factor them in. We could also repay more monthly, but we do not want to, as we want to use any surplus at the end of the year for special repayments. As I said, thanks for the answers and criticism. When criticizing, however, please consider ALL facts before labeling something as nonsensical and failed.

You should have simply written that right away, you see what comes out of it. ;)

Here, the €200,000 is seen as problematic, which is also understandable because it is only repaid with 1%. But you mention something about a 10% special repayment, which has not been considered so far.

10% is €20,000, can you really afford this amount and how does it come about?

Regarding the "certain things" ;)
1. Do you want to sell them after ten years or do you want to rent out this apartment after moving into the house and use the rent for the special repayments?
2. Due date at retirement doesn’t do you any good in the case of a ten-year fixed interest period. ;) If the insurances are not canceled before maturity, you can expect that.
3. You have already said everything about that. ;)