Just replying to my own post here (that way madness lies!) it looks like the three locations I have looked at
1. an apartment in Evere
2. Aparthotel in Grimsbergen
3. Aparthotel in Laeken area
will cost approx., by taxi
1. 38 euros per day
2. 30 euros per day
3. 44 euros per day
Grimsbergen is the nearest and cheapest - but im concerned about if it is walking distance to shops etc @Valentjin I think you have stayed in this area - any deas on what the village is like?
Evere - a residential area of Brussels, but some small shops nearby and tram right outside door for getting into town (which would be good for my bored family members who will be coming with me - better than being stuck in Grimsbergen perhaps?) also the apartment is the second story of someone's home, and they seem really nice people, so could be good for me to at least have friendly people around (although of course I wouldn't impose)
Laeken has lots of shops, bars, restaurants nearby as well as big parks - again, might be better if my grown up children are coming.
I know this is a lot of detail that some may not be interested in, but others may come after me who can read this thread and know a bit more about it. I always do a lot of research before I go anywhere.