Earlier quoted context omitted.
I don't live in the UK but I know that feeling of living in a small but wealthy European college town. It looks nice in photos but job opportunities are scarce for those who aren't doctorate alumni of the local university and also rents are expensive, there's no subway so everyone is bumper to bumper in cars.
Cambridge is small enough, and cycle-friendly enough that nothing is more than 15 minutes away. Bumper-to-bumper is a choice (assuming you live reasonably near the centre)
As for living in the city, you either have to share with someone or pay exorbitant amounts for something tiny. And what are you even getting for the money? In London you get to live in a world-class city with the best public transport in the country. What do you even get in Cambridge? It's only famous for its university, and that is off-limits for plebeians.