BCS or Acacia

In the course of searching for schools in Brussels, we visited BICS (Rue Général Leman in Etterbeek, which is what I think you mean, http://www.bicschool.be/). The first thing we noticed was the conservative Catholic atmosphere (young priest in black cassock teaching religion class, long discourse on Catholic philosophy from the admissions director, etc.). I assume if you're deciding between BICS and Acacia, you're cool with that; we weren't, but that's just us.
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The student body was very diverse with a good mix of primarily anglophone, primarily francophone, true bilingual, and allophone students, as well as a cultural and ethnic mix.
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The French-component teachers we spoke with seemed fine, but we weren't impressed with the English. The head of the primary-school English department was not a native speaker. She had a Scandinavian accent and did not speak flawless idiomatic English, which seemed problematic in an English teacher.
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Hopefully someone with kids actually at the school will give you a review based on more than a couple hours' visit, but those were our impressions. Needless to say, our kids aren't headed to BICS, but mostly based on the religion component.
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Good luck with your search.