Hiii,
I'm going up to my second year at Medway this year.
In terms of accommodation; Merlin & Wolfe are cheaper, but the rooms are also smaller and your "en-suite" is actually more like a shower pod/wet room. Merlin also doesn't have sofa areas, but Wolfe does. Adelaide, Forte and Sunne are roomier and generally a bit nicer (bigger kitchen/seating area) It's not the ritz, but it's habitable like most student rooms.
The campus isn't too lively, but it is mixed/multi-cultural and it's all what you make of it really. Freshers week will be lively, with events at Coopers (campus pub). Some societies are more active than others, but you will probably find something you'll enjoy. If you didn't know, the campus is shared with Kent Uni and Canterbury Christchurch, so there are plenty of people to mingle with. We did get a few noise/party complaints though, so it's not dead either.
The campus has a shop (essentials) but you'll probably make better use of Tesco Express by Liberty Quays (which also has a Subway and Dominos) or the Co-op at Dockside. Speaking of which, Dockside also has an Odeon, Nandos, Pizza Hut, Subway, Dean's diner, Chinese buffet, Chimichanga, Zippers (cheaper version of Prezzo) and Burger King. It also has a Cadbury shop! And 'Ship and Trades', which is a really nice pub, but not student prices.
Nightlife in Medway may leave something to be desired for some, but again it's what you make of it and personally i've had some great nights out in Medway; it's all about the people! Monday nights for Tap n Tin (£1 drinks) which is a more unique style club; more rock/grunge downstairs, more chart stuff upstairs so it caters for most. Thursday nights for Casinos (£1.30 drinks) in Rochester, which has 3 rooms but most collect upstairs. There is also Krystals but i've only been there once (it was pretty good though)
Rochester also has a Wetherspoons and a few bars/pubs (try Rochester bar) and there's City Wall Karaoke bar. Gillingham has The Black Lion and some other pubs (Gillingham isn't the best of places though)
Of course, there is always Maidstone which has a good nightlife and is a taxi ride away (make sure there's at least 5 of you sharing though, if you want to make it easier on your pocket)
Shopping wise; there is Pentagon in Chatham which has your basics, but you're better off with a trip to Bluewater (20-30 min bus journey) or a 30 min train to Stratford Westfield (not too bad with a railcard, and it's a high speed service) but if you're not too into shopping then you'll probably be alright.
I don't know what course you are doing, but for Biomedical Science I find the teaching standard to be pretty good. Greenwich is climbing up the league tables so it can't be doing too badly! Car parking is something you'll have to apply for a permit for and pay for i'm afraid, as there is not a lot of parking off campus, but it's not too pricey for the year. (There is a spot opposite the back of the uni on the way to Gillingham, which isn't technically a road but people do park cars there, if you want to chance it. My flatmate did it for a term last year and she was okay, but be prepared to be blocked in a lot if you do).
I think that's pretty much it, it'll be a good experience if you want it to be so enjoy it