Never been but: There are 12 Check-in desks, 5 Gates, and 3 Baggage Reclaim belts. There are 2 passenger terminals, and 7 aircraft stands. Annual capacity is Approxiametely 2,000,000. The airport has a very restricted choice of facilities; passengers will find no financial services and only basic dining and refreshment options, while shopping is restricted to duty-free only. There are no business facilities on-hand at the airport. Airport facilities at Kos Ippokratis Airport (KGS) include:

Duty-free shopping and dining and refreshment facilities
Business facilities at the Neptune Hotels Convention Centre and Spa
Car hire / car rental companies at KGS airport
Parking spaces for 220 vehicles
Disabled facilities
Bus, taxi and hotel shuttle transfers from the airport to the island’s resorts.
Thats all I can really find.