The whole of the EU (theoretically) should be on 220V 50Hz
Theoretically it's 230v iirc*, although down here it seems to be anything up to 243v according to my voltmeter / plug in power monitor
But yes, at most all that is generally needed is a simple physical adaptor due to differences in the plugs/sockets used
*Chosen as it was half way between the voltages used in the various countries (some were 220, some 240 like us, and 230 was within a safe range either way).