I just don't see any rental yield anymore. And this should actually determine what a house is worth.
A small example with numbers as they are currently approximately with us:
Apartment 90 sqm
Rent 12€ / sqm
Purchase price including additional costs approx. €350,000
Equity = €100,000
Interest = 3%
Repayment = 2%
Annual annuity = €12,500
Annual rental income = €12,960
Surplus after interest approx. €5,000 in the first year. That would be 5% return on equity in the first year. In the same example with 1% interest and 4% repayment, you would be at 10% return on equity, but would have a significantly higher tax burden, so the numbers haven’t really worsened that much in reality. For "real" investors, still a good investment. But for those who hope to make big money with real estate without equity, different times have now begun.