Accommodation- its all pretty good but varies from the likes of whitefields/cryfield (smallish room, no ensuite) to those of arthur vick/lakeside (pretty much like living in a hotel). Price wise its from about £50ish a week to £90 or so a week.
Parties- what you make of them really. I go to a fair few as all of my mates are mainly off campus now (being a 3rd year) so they hold house parties, you'll probably have a fair few in halls though (been to a couple on campus this year).
Nightlife- the union is OK, it gets a bit repetitive once you go there all the time for 3 years though. Coventry has a fair few bars (bit knifey, not too big a fan of them but they're ok for a pint or two), and a few clubs (collusseum, ikon/diva etc). Leamington has mirage (or whatever its called now...), sugar, robbens well (good alternative music scene there) etc.
Surroundings- coventry. Not the nicest place in the world. Does the job though with stuff such as tescos nearby, downtown cov isn't that far on the bus either from campus. Birmingham is nearby too. Then theres leamington. Some people prefer it to cov (bit less concrete, looks a lot nicer (north leam), south leam is as bad as cov imo), personally i'm not so sure, its ok but a bitch to get to/from if you live in cov...
Company- join sports teams/societies and you'll meet loads of like minded people to go to the union etc with. Especially important if your flatmates in your first year are a bunch of arses. Its what you make of it though- if you spend all your time shacked up in your room then you'll expect not to make friends etc- remember that as a fresher everyone is in the same boat and looking for mates so its pretty easy.