BE MINDFUL OF CURRENT CONSUMPTION.
They make Switcher converters which are great for 1400Watt hairdriers, but won't charge a cellphone. They also sell little 50-Watt transformers which will charge your cellphone, power your electric shaver etc. but plug a hairdrier in, and you'll smell something very unpleasant.
Trouble is, transformers are HEAVY if you need lots of amps, and switchers are lousy if you need a tiny amount...
So get one of each, and read the first line of this post again.
...and again... and again.
Also, you'll need to go TO 120V, not FROM 120V... Basically all of Europe is now federalised on 237Volts, if I recall correctly. Basically 240V.
The hertz don't really matter unless you're running a turntable or a Hammod Organ.
And if YOU are going, take a moment to go to the motor museum down by the confluence of the Saone and the Rhone. -unless things have changed, they still have Hitler's staff car there, with a bullet scratch in one of the windows, from where an SS officer fired his pistol at it, to prove that it was bullet-proof...
Keith