The area around La Farandole and St Stanislas is much much much nicer than near Sans Souci-Petits Moineaux and Sainte Trinité, I'd say better than Jardins d'Elise too, but still anywhere between Mérode and Tomberg is much better than Etterbeek or Ixelles for a young family to live. You get cafes and restaurants all along metro line 1 from Mérode to Stockel, with the exception of the stretch Vandervelde to Kraainem.
I wouldn't touch les Maronniers in Auderghem.
Vervloesem, well it's a good school but it's in your idea of suburbia surely? If you're looking at Vervloesem, then why on earth not Stockel which is more urban?
Chant d'Oiseau is actually very surburban, again Stockel, Tomberg, Mérode, all those areas along metro line 1 are actually less suburban than Chant d'Oiseau. So I cannot see why you are looking here.
Paradis des Enfants is a good school, but with almost 1000 children, I wouldn't be happy there as a non French speaker amongst the crowds, fine for a family here for several years, but for newly installed, I think it's too big. Maybe I shouldn't have suggested it. That's why I didn't suggest SC de Lindhout either, great school but just too big. But having said these 2 schools are big, I'd still choose them every time over your current list of 3 schools. Why do these 3 schools alone have places? Think about it.
Ma Campagne is in my opinion far too far from work for cycling or public transport, although the school is reasonably good. Personally I don't think the area is great for young families, but those who do have their children in Ma Campagne and Tenbosch are happy. Just take a look on the map though, it's much further to get to work from there than along the whole of metro line 1.
Centre is a Dutch immersion school, not sure I'd choose there, your child would be 2e maternelle in French then 3e maternelle onwards in Dutch, unsatisfactory situation when newly installed in Brussels, stick to Jean 23 Woluwe around the corner.The school is in a poor condition too.
Bonheur is a very good school and the area is much much much much better than where you have school places in Ixelles. It's better for a commute to work too. You haven't looked very well at it either, it has a lovely grassed area, especially considering how built-up it is, it looks nothing like a prison from the outside, are you sure you are looking at the right school? I'd have it top of the list actually. They even have a Danish and Italian flags over the entrance, it really is a welcoming international school!
La Retraite du Sacré-Coeur?