I'm a third-year at UEA and stayed on campus for my first year. The best quality accom is Barton, Hickling and Crome (three separate buildings but all to the same specification) however it is the most expensive (not sure on costs anymore as they change every year but check the UEA website) - the facilities are much nicer than anywhere else on campus primarily because it's the newest, the kitchens are without a doubt the best of the lot.
The next best I can recommend comes under "En Suite Campus" which is basically several accomodation buildings and what I stayed in (one called Colmon House, but whatever building you get doesn't really matter it's all the same inside). The price of accom nowadays is ridiculous but that goes for most uni's so I don't even know what is bang for your buck these days but I had no complaints about anything in en suite campus, the kitchens are dated and if you do want a good one then it has to be Barton, Hickling and Crome. But rooms are decent size and all the buildings are pretty central on campus. The Village also offers single room with en suites but it is outside of the campus (although it is literally a 5 min walk).
If you're very social and like a flat party, then it has to be the Ziggurats. You kind of have to put the social benefit in front of actual living though cus they're listed buildings to there's only so much they're allowed to modernise plus it's all shared rooms/bathrooms.