Sorry, been marking GCSEs, so hadn't looked at MN recently.
If you are coming out here with the Armed Forces, a house will be found for you. There is a great team at NATO (UKSU) who sort all that out for you. You will also be allocated a sponsor who will contact you and give you all the low down on what things are like; where to go for insurance, bringing cars out etc. School fees (day) are all picked up if your kids go to school here (mine goes to BSB) and the MOD also pick up the extortionate school bus fees. Health care is through SHAPE, and the GPs and the dentist come up to Brussels regularly, so we don't have to trek to Mons. As to housing, it isn't on a patch, as there isn't one; we are all scattered about; but the houses I have seen so far have been fine. I don't like the kitchen here, but I was spoiled in having a massive kitchen in Cornwall, so this was a shock, but I get by!
Life is great here, DH (who is RN) had a NATO posting for 3 years, and is now at the EUMS until next autumn. We want another appointment here as we really enjoy it.
There is a lot of support if you want it, but I'm involved at things at the school so I tend to make my friends through there. I'm not a huge fan of BSB at all academically (imo they are a comp by any other name), but socially, there is a contacts group who run trips and do get togethers for people to get settled. They run a range of courses from Yoga to cake decorating and various trips to places like a Sap and a holocaust museum, so a wide variety.
Language is not a problem. I live in a Flemish speaking area, so have done two years Flemish classes through the commune/gemeente; but it might be worth learning French depending where you are going to live. Classes are cheap and quite fun. Most people speak English, which is great, but not when you've spoken to them in Flemish!!!!!
Food is good - supermarkets are OK, and there is a shop called Stonemanor which sells all things British, including Hovis, real tea, and proper clotted cream. However, the bakers and patisserie are superb here, so I don't buy UK bread, as it is so good locally. The beer and chocolate are also fab.
Clothes and shoes are expensive here, so I tend to hit Tesco for ds when home, and the shoe shops as well. Luckily Boden delivers BFPO (the only thing that goes round ds at the moment - he is 13 and fits into a small mans size here; they cut for much slimmer teenagers here than mine), so I buy what I know will fit!
Amazon and various other companies also deliver BFPO, so there is normally no hassle in getting things, and we have satellite TV which gives us all the UK channels we want and radio, (including BBC Southwest) so you can keep up with what is going on back home.
I had to be prised out of Cornwall to move here, as I had a good job and our own place and I was loathe to move. However, I love it and am really enjoying my time here. Like any place that isn't 'home' there are bits that drive me scatty (shops shut on Sundays; shops and banks closing at lunchtime where I live), but that will always be the case. The nice thing about Brussels is that it is foreign, but not overly so, iyswim.
Tell your dh to take the job; my dh found NATO varied and interesting, as he does the EUMS, and he wants to go back to NATO for his final job in the RN.
I'll keep an eye on here, so any thing else, however daft you may think it is, please ask. No question is daft, especially if it's worrying you.