I'd recommend Barton le clay, Bedford, silsoe is lovely. Anywhere but Luton.
I lived in Luton as a child. I would seriously recommend to you, that you keep well away from the town.
Luton seems to have a benefit culture, lots of racial tensions, paired with a high addiction and crime rate, it's not exactly the place you want to bring kids up.
Also, please note, the guy who told your dad to keep away from the pubs was right, not being funny but the pubs on the estates always had a pretty "rough" reputation. There were pubs in Lewsey Farm, that would be done up, done over, done up, done over, done up, done over until the brewery got fed up and refused to do it any more.
Dallow Road, where many, many of the addicted live. My father lived there for years whilst in the depths of his addiction. Much of the area has been bought by one man, who rents rooms in houses to those on HB. The amount of stuff that goes on down there is crazy.
Marsh Farm, also has a bit of a rep, a few years ago there were armed police on the streets there. My DDs GF works the ambulances in Luzon, I remember him telling me, Marsh Farm was a no go without a police escort some 8 years ago. It was quite common to have all medication stolen from the ambulance and or multiple bricks thrown at them.
Oh I could go on and on about this town. You should visit. Have a look at the Arndale, have a look at the Galaxy...check out the bowling area. That hasn't been touched in 20 odd years since it was first opened.
Check out crime rates.
Look at the school performance stats. Don't think they do too well.