In which European city is this true? I can't think of any. Certainly not London/Paris/Amsterdam/Munich/Warsaw.

For comparison, Amsterdam's price per square meter for apartments is some 30% higher than in Seattle and my big tech company that offers total compensation around $500k/yr for L5 in Seattle pays low $200s (converted to USD) in Amsterdam. The only colleagues I know who live in a single family home within reasonable biking distance are late career (L6/L7) American expats.

In any European city, that has a decent tech job market, owning a house (even a small one by American standards) in walking/biking distance of the office means you're rich rich.