Perhaps I can help a little since I was just in Barcelona. I have a travel hair dryer that will switch voltage from 110 to 220, so all I did was switch the voltage and then use an adaptor for the plug. As for my camera battery charger, I had to use a converter and an adaptor.
Since I've traveled to countries all over the globe, I bought myself a good adaptor/converter set that I've used for years. I bought mine at a local travel store, but you can also get them at
www.worldtraveler.com which is the web site for Kaehler World Travel stores. You will notice that they have things from just plain plug adaptor sets for $12.50 to more advanced converter and adaptor sets for $42. I have bought things from Kaehler before, and as you can see, they have a wide variety of travel products. Just a suggestion!