I'm in Canterbury, it's not too bad, but as people have said, there are good parts and bad parts. Very lively pub life, and there's at least 20 or 30 in the city centre, so take your pick. There are clubs and bars too, Chill and Studio being the main ones. Cinema, handful of primary and secondary schools, library, lots of shops.
All in all, its your average city with a mix of everything. Nightlife isn't too bad, but you don't want to be out alone any later than 10pm, it can get a bit rough. Herne Bay and Whitstable are about 20-30 minutes away by bus, and there are services all over the place.
Oh, and be prepared to see tons of students and tourists. It is very multicultural too, but there's a lovely atmosphere and some beautiful places, notably by the river and the Cathedral. Any more question about the city centre (with the exception of housing, I'm too young to worry about that - all I know is that there are a lot of new home developments and such), just ask. Been here for 17 years.