This is 110VAC only - primarily North America. 220VAC will fry the unit plus the plug is not compatible for 220VAC. If it is NOT available in a 220VAC appliance in Europe (or elsewhere) you could use a Heavy Duty converter. This is not recommended as the unit draws significant amperage on start-up and could fry the appliance and converter.
I have the KitchenAid freezer bowl and am looking at the Cuisinart because I have had problems with the other. The main issue is that it takes much longer than the 20-30 minute stated time. In fact, one batch never did get beyond slush and I had the bowl in the freezer days before I made the ice cream.
No, One bowl one batch, then refreeze and depending on your freezer the length of time to use again, I have 2 bowls for 2 batches, You should also keep the bowl in the coldest part of the freezer for best results.