Brussels

[moovelvet]

So... I'm taking a trip to London in January. I've got a few things to do and I have more days than I need. I was thinking about hoping the Eurostar to Brussels. Good idea, for a day trip? Bad idea? I've been to England 5 times prior to this and have seen most of what I'd like to see and have a trip planned in May to head back to London, so it'd be okay to spend a day or two elsewhere.

What should I see in Brussels? Where should I eat? How easy are the trams? Give me all the experience you've got, please and thanks!