2008 was the first time I had the opportunity to work in Brussels. Man, what a great city. The transportation is great, the amount of walking allows me to see all the great architecture and then there's the great food.
In all my visits, I stay in the Avenue Louise area where there's great shopping, restaurants, and neighborhoods filled with interesting people (for example, Andrew, the old man in the bar/restaurant who wanted to marry me and come live in Georgia).