Desirable property affordable? Experiences?

A small update from my side:
- In the meantime, I have received a promotion that raises my salary to €5,900 net (excl. bonus)
- I had a conversation with the financial advisor, who considers a loan amount of €660,000 feasible at approximately 3.9% interest (or 3.55% taking into account €150,000 KFW renovation loan), 15-year fixed interest period
- Equity has increased to €100,000 through stock gains

We are now considering possibly making an offer for the mentioned property.
Calculation as follows:
- €550,000 purchase price (instead of the listed €620,000)
- approx. €60,000 incidental purchase costs
- €150,000 estimated modernization measures
- Total = €760,000
- Minus €100,000 equity
- Loan = €660,000 = €3,000 monthly installment

Income of €5,900 + €500 child benefit (+ not considered: approx. €1,000 part-time income of wife + approx. €1,000 net bonus pro-rated monthly)
So €3,400 remain per month for all other costs (so far these costs are €2,750).

Would you still strongly advise against making an offer to the seller? From which purchase price would it become realistic for you?

You really have a great salary without a doubt, but a €3000 installment without any certainty that it will be enough is a real hammer.

You pay €330K in interest alone in the first 15 years and still have an outstanding debt of €450K. That is way too much. Just for the interest of the first 15 years, you could rent something for over €1800. But then you have €1200 more available monthly. The higher additional costs are not even considered, and the €450K debt will still be on the clock for a house that had its last renovation 15 years ago. By comparison, we will have paid about €26K in interest for our house by the time it is paid off. It is not a fair comparison since the interest rates and construction costs were lower, but those are worlds of different costs, and in the end, we both live in a house—ours paid off and yours with a €450K remaining debt. So for me, that is massively too expensive right now...