I heard it's the largest airport in the world, don...

I heard it's the largest airport in the world, don't know if it's true. However one of friend had other experience according to him "The airport is nice and people working there are nice too. However, the problem is with the Global Exchange at terminal 4 S. They tell you that you can only have your tax refund in your country s currency because your currency is not Euro. It is when you start shouting and yelling when they say oh we just suggested but you have a choice. And then they give you your tax refund in coins so that you can only use them in Europe and cannot exchange them in your country at a better rate".