They're all pretty good, actually, one of the reasons why it's now nearly impossible to buy a house in Cambridge. FYI Milton Road, which a few weeks ago was rated outstanding, has been downgraded to needs improvement in its very recent Ofsted. Which school is really not worth getting worked up about.
Park Street, by the way, has a catchment about the size of a pea, nearly all of which is student housing, and you won't get into it as a Church of England applicant unless it's your closest CofE school (unlikely). Don't bother. The other central-ish schools include St Paul's (CofE), St Alban's (Catholic), St Matthew's, Morley, Milton Road, Newnham Croft. All good, all full of academic middle class children because Cambridge is that kind of place. Loads of the other schools are good too - off the top of my head Mayfield, Queen Edith's Ridgefield, Queen Emma.
It's not London. There just aren't any really bad schools. More generally, there's not much crime. It's frankly all rather staid.