Assessment of financing offer 1.58% 20 years

Hello , after 15 years, a part of the loan should have been paid off. That’s why the installment won’t double, how could it? Unless I start out with such a low repayment rate and don’t make any special repayments. But then I have the problem that I’m not finished even after 30 years.

When I read that people prefer a shorter fixed interest period because of a few tenths less in interest, it makes the hair on the back of my neck stand up. We are talking about really just a few tenths; especially when one's financing is a bit tighter, one tends to choose security. Not so long ago, when I bought an apartment with about 60% loan-to-value, I still paid 4,x % for a 5-year fixed interest period. The fact that some here can look 15 years into an (ever more rapidly changing) future really amazes me...

Because an increase from 1.0% to 1.5% is not just a few tenths, but 50% higher interest costs. Very short terms can be worthwhile and help with debt reduction if the saved interest is then used for repayment. It is dangerous to use the 5Y interest rate with 1-2% repayment because otherwise the burden would be unbearable.
But for your 4.x% interest, there was also 2.x% inflation.
Apart from that, hindsight actually plays no role in decisions to be made today.

One thing is clear ...products that promise the bank profit are offered or sold first...

Here everyone can speculate for themselves ...why should the ECB raise interest rates?
It wants inflation and to slowly devalue the money...

The TE apparently had offers of 1.42 for 15 years vs. 1.58 for 20 years. For me, those are few, or not even 0.2. Since I do not trust myself to look 15 years into the future and would call anyone who claims that a charlatan, only the 20 years would be an option for me in this case. After 10 years, he can still see what the situation is then. BTW, I am already wondering whether the interest rates will (hopefully) still be at a similar level as today in 5-6 years...

Hello , after 15 years a portion of the loan should already be paid off. That’s why the installment won’t double, how could it? Unless I start out with such a low repayment rate and don’t make any special repayments. But then I have the problem that even after 30 years I’m not done.

A portion will still remain after 15 years, for example half of the loan. What is wrong with a repayment term of about 30 years? Not everyone can conjure up special repayments (that's why they are called special repayments). What is the advantage of a 15-year fixed interest period anyway, if I assume I will repay over 25-30 years? I will never be able to refinance as cheaply as I can now.