My current tendency is really to take the 10 years with my main bank, with a repayment rate of 4% at 1.59% interest. But without the building savings contract. That is manageable for us in terms of payment, and we could even accomplish something extra with special repayments.
The 1.59% is definitely only achievable in combination with the building savings contract, which then serves as additional security. Without the building savings contract, the interest rate for a 10-year fixed interest period is likely to be somewhat higher.
My financial advisor thinks I should go for 15-20 years and reduce the repayment rate and try to solve everything with special repayments.
If you have enough leeway, I wouldn’t reduce the repayment rate too much, otherwise you take away the chance for special repayments if more money than the 5% becomes available. It is possible to agree on 10% special repayment options in some cases, but that is probably again associated with an interest rate surcharge.
Going for 20 years when you expect to be finished in 15 years is complete nonsense.
Roughly calculated: 1000 cold rent + 800 savings rate minus 100€ additional incidental house costs compared to the apartment minus 300€ reserves for renovation results in 1400€ financial leeway.
1400€ minus the 940€ installment leaves 460€ surplus per month. So just over 5000€ surplus per year.
I find the rate just over 900€ quite well chosen. This leaves room for special repayments upwards and downwards, and with about 5000€ in special repayments, you can manage to pay off in 15 years.
You could post the interest rates of Ing-Diba, where you can calculate more precisely, since I – as mentioned above – don’t believe that you will get the 1.59% interest rate. I personally would go to a broker. There you have the interest rates of all banks at a glance and can find the most favorable one for you without much effort or negotiation skills.