Thank you for the answers, but so far no one has been able to help me with a return calculation. Assuming a personal tax rate of 30% (estimated), a loan of €200,000 under the mentioned conditions, expected rental income of €3,600/month, no rent increase, including depreciation, excluding renovation costs (for the time being), I come to a return of 1.4% in my Excel sheet. Adjusted for inflation, so basically nothing. In case of doubt, with rental loss during tenant change or other factors, renovation costs, rather a loss than preservation of value, which is at least the issue.
Is this calculation realistic? If yes, it is obvious that this option is nonsensical.
Don’t be offended, initially I am not concerned about alternative investments, there are several (I also do not consider 5% return on leasehold land realistic, do the math, rather 1.5%). Actually, I am not a fan of real estate; if I had the courage, my investment strategy would be clear, a global ETF-based portfolio. But we are self-employed, no pension, 50 years old, and this capital must be preserved. So no luxury problem :), we live down-to-earth and reasonably.
Martin