Berlin, regulation pioneer
The Zweckentfremdungsverbot (misuse ban) has applied since 2014.
Current rules
Primary residence: tourist rental with permit and registration number. Secondary residence: max 90 days/year with permit. Fines up to €500,000.
The market
12M+ visitors/year. €60-140/night in Mitte, Kreuzberg, Prenzlauer Berg.
The booming alternative: mid-term
Berlin is Germany's biggest furnished mid-term market (€1,200-2,500/month) — outside the tourist regime. These guests book direct via Google: a German/English CapDirect mini site converts them commission-free.