Hitchin? A nice Area? You've got to be kidding! It was about 15 years ago, but has gone dramatically down hill unless you're in the right street, in the right area. (which are few and far between)
Don't get me wrong it's not really awful, but no where near as nice as it used to be, and house prices now reflect that.
Letchworth is mainly pretty cruddy, although has some very very nice area's I'll see if i can find the postcodes of the nice bits.
Stotfold is up and coming, it's never been a bad area, and has alot of new build going on.
Baldock is lovely but you'll be hard pressed finding places to live there, and not a huge amount of family friendly fun.
Stotfold is alot more than one street & a corner shop, it's about 30 streets and a corner shop! although rapidly expanding. Seems to be more houses every time i drive past it!There are a few parks too. It doesn't have much along the line of amenities. The co-op is pretty big though. Don't get me wrong it's a lovely place to live.
That said, Letchworth has an outdoor & indoor swimming pool, which are both pretty good, as does Hitchin. Letchworth also has a cinema, but it's a bit run down.
If i'm honest again best place for family activities is Stevenage, which is about 20 mins away by car, they have a large kids indoor play center, with lazer tag, cinema, bowling ally, plenty of parks & fairlands lakes which have paddling pools, sailing & a cafe. There's also loads of restaurants. (don't be put off by Stevenage's reputation it's got miles better in the last 10 years (again house prices reflect this)