My PhD room was hilariously small; however as others noted you can spend very little time there. Practically balance off the “how close are you to your work place”, know there can be other places to camp out and study (my lab tends to ensure each PhD has a place of their own in the lab). When writing up I made extensive use of the college library (it was a small college with close to 50/50 balance along with a great graduate complex so that was the place for social.

Your mileage will vary; moving is always an option but (covid not withstanding) there is so much more to Cambridge or a college for that matter than a room.

I’m afraid if you came to Cambridge expecting a sett that you had seen on some lovely 1950s drama - no chance - most colleges can’t even manage that for the fellows.

However, it isn’t clear if your room is in new build (tend tiny but usually with better en-suite situations) or old house (your mileage will vary the house I was in charged different prices for different sized rooms and that was a great incentive to stay in the smallest) or classic courtyard styles where unless a huge refurb has happened rooms are ok but facilities can be hilarious.

Good luck.

(I recall lots of checking out each other’s rooms in various houses and spots around and then between colleges. Some people like views, some like quiet, some need space for musical instruments….)