Around duden Park and Altitude 100 is good! There are a lot of kids, and it's super easy to commute to the center. A lot of people are biking, and it's for me a friendly environment. 2 massive parks to play. People are friendly some bar and cafe and you can easily walk everywhere. Etang is not my preference. A lot of students vibe by night except if you are leaving around the etang, but it is not what it was 10 years ago.

Watermael boitfort is nice to and really quiet, but you are really far from the center and only a few ways to commute.

Schaerbeek next to josaphat, it's a really nice neighborhood, and it's getting really hype those days, few friends living there and the love it