To bring you up to date a bit, Prudie:
As stated above, Whitstable is a delight, with lots of specialist shops, a lovely museum and loads of great places to eat and drink.
When I was staying in Whitstable, quite a bit of my work was around Swalecliffe. It didn't strike me as one of the most attractive places I've visited (and the pubs and shops looked rather ordinary too) but neighbouring Tankerton is much nicer (both within the town and down by Tankerton Cliffs beach).
I've worked in Ramsgate too and I was pleasantly surprised to find it to be a rather trendy, upmarket town (rather than the dump that many current & former ferry towns have become), with a wide selection of good bars and restaurants.
Folkestone is another town where I've worked. Much of the town centre is rather drab but there are still some nice areas if you go exploring. The seafront road has been closed off and the area turned into an extremely attractive park, which is well worth a visit if you're in the area.
I seem to have had plenty of work in Kent, as I've stayed in Dover lots of times. While it might have a few redeeming features, there's no getting over the simple fact that it's a dump!
Ramsgate (which I visited on a day off from working around Whitstable) is struggling to get back on its feet but, until recently at least, it had the highest percentage of empty shops of any town in Britain, so it was inevitably very shabby. The Turner Contemporary art gallery has given it a bit of a boost, as (hopefully) will the reopening of Dreamland (after many years of standing derelict) this coming Friday but it's still got a long way to go.