I found this qualification about the adapter :
"This USB Power Adapter has fixed prongs for use in the U.S., Canada, Japan, Taiwan, and parts of Latin America."
So for Europe, you would need a powerplug adaptor. It should work then.
(may I suggest that for a very reasonable price you can get Europe specific adaptors which will provide USB power ? more elegant solution than putting a US adaptor on a powerplug adaptor ...)