If you're looking at this site, book it! You won't be sorry. Antwerp has enough to see and requires a minimum of two days to see, if not more.
Christian was excellent, spoke excellent English, gave us a walking tour of the city that was very informative.
This was just a quick stopover for us, next time we'll stay longer. The streets are old and narrow and crooked. So take a GPS or your phone to remember where you are staying, easy to get lost. Highly recommended.