Doing a Cambridge PhD while living in London - feasible?

I’m starting a funded PhD in History at Cambridge this October. I’m a slightly older student (30s) and have recently bought a flat in London, so paying for Cambridge accommodation on top of mortgage repayments just isn’t really doable on a PhD studentship.

My plan would be to go to Cambridge around 3 days a week, spending full days there for supervision, seminars, libraries, college stuff etc, and work from home in London the rest of the time. I’d also stay overnight occasionally - maybe 2/3 times a month - for evening events, dinners or particularly busy days.

Has anyone done something similar, particularly for a humanities PhD? Is three days a week in Cambridge enough to feel properly involved, or would I end up missing much by not actually living there?

And practically, is the London-Cambridge commute manageable long term, with occasional overnight stays when needed? I live in north London.

Basically, does this sound like a feasible way of doing a History PhD properly, or am I underestimating how important actually living in Cambridge is?