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There is an European socket (240V) and American socket 110v on most ships under the dresser /desk unit.
The 110v in the bathroom is for electric shavers only.
I would advise you to take the adapter, then you can use / load two appliances.
From Costa UK Web site:
Voltage on board
The power points in the cabins have an alternating current of::COSTA FAVOLOSA, COSTA DELIZIOSA, COSTA LUMINOSA,COSTA PACIFICA, COSTA SERENA, COSTA CONCORDIA: 220-115 Volts.
COSTA MAGICA, COSTA FORTUNA, COSTA MEDITERRANEA,COSTA ATLANTICA: 220-110 Volts/60 Hz.
COSTA VICTORIA e COSTA ROMANTICA: 220 Volts/60 Hz. perrasoi, 220-110 Volts (1200 W) in the cabin.
COSTA CLASSICA: 220 Volts/60 Hz. per rasoi, 220 Volts (800 W)the cabin.
COSTA MARINA e COSTA ALLEGRA: 220-110 Volts/60 Hz. forshavers.
For safety reasons, electrical appliances may not be used inthe cabins with the exception of electric shavers; ironing inthe cabins is strictly prohibited. Each cabin has a hairdryer.