Electricity in Cuba
Sockets are usually two-pronged flat-pin (US type).
Electricity in Cuba is mostly 110 volts (especially in Casa Particulars).
This means that any European electrical equipment will be very slow.
Beware of mobile phone & camera battery chargers.
You may be lucky, and if your room has air conditioning, then you may also have a 220 volt plug. (Which is usually indicated by someone writing "220V" in ink beside it! Check before using it!