What Athens agencies should prove
Named Acropolis or museum slots, correct port advice (Piraeus vs Rafina for Cyclades sailings), and island subcontract disclosure when they are mainland desks.
Strong operators keep day one in Plaka or Koukaki with a short Acropolis window—not stacking Meteora and islands on jet-lagged arrival.
Athens desk vs island operator
Capital-heavy trips (Acropolis guides, food walks in Varvakios, Riviera extensions) benefit from Athens-based incoming teams. Island programs need named island staff—not opaque handoffs.