We spent a few hours in Antwerp last year and here's what we wrote:

Antwerp highlights - wonderful Markt, guild houses with golden symbols (St. George and the dragon for the crossbowmen). Lovely low key lunch at a studenty cafe, Did#s Bistro - omelets with a huge salad. (St.-Jacobstraat 21) Antwerp is a congenial city that looks like it would repay a longer visit.

We travelled by train so I can't tell you about buses.

For more information about Antwerp, try Jack-travel. I believe he lives in Antwerp and has a lot of insider information about the city. http://tinyurl.com/p4qd

Frances Toronto, Canada