Atmospheres in Exeter's halls. What do you reccomend?

I'd say Lafrowda or St Germans - they're both really sociable (again, it depends on the people but there's such a range plus see my point about residence life) and are nice flats.

A bonus about university 'owned' ones are the residence life team, as they are pretty good at placing people in flats with similar people!

St Germans has proper shower en-suites with double beds (well, all bar one of the blocks in St Germans), and is the one I was placed in during first year so I'm biased... but honestly, hard to go wrong with those two.