We traveled onthe Norwegian Gem/Meditteranean in June there were 3/4 sockets in our inside cabin on deck 5. There was a socket for the coffee machine and 2 sockets on the dressing table 1 was 110 and the second was 220. There were no sockets at the headboard area of the beds. There is a hairdryer in the bathroom which was very good.
We had an inside stateroom recently with only one european socket and a 110 socket for the coffee maker. However we took a 3 socket extension lead with us which we used to charge mobile phone, mp3's and toothbrushes with no problem!! Agree the hairdryer was excellent.