I am from Brighton originally, left in 2007 ish, for a career. I consider myself incredibly lucky to have done most of my teenage years there, I loved it. Lots of gigs as was always on the tour map for bands big and small, lots of happy vibes and one of the few places I could go into a pub on my own and chat to people without being hit on or smarmy. Brighton was back then at least full of characters and was a very forgiving place to live, ie, didn't matter what you looked like, what your sexuality is or anything really. I can remember taking my partner on a few occasions and he remarked how lovely it was to see gay people openly hold hands, cuddle and nobody around blink an eye. It is a fairly white area but cannot recall any issues regarding aggro for those who were not.
I had a bright red and black mohawk for a few years back then and never once had any trouble, the only people who said anything were a bunch of Japanese tourists who asked if could take my photo while out on the beach one day!
It does however have a drug and homeless problem, back in the 80/90's it had a high proportion of people with aids, all these problems have been around for as long as I can remember, Brighton was known to be a little seedy before they did it up and it became little London. There are areas not to buy a house in, such as Moulsecoomb which is as true today as it ever was, it would occasionally kick off with riots there and it's really rough and tatty - even street signs got stolen, weirdly. It's a shame as lovely big houses.
Brighton some 30 years ago spent a fortune doing it up, the seafront was improved massively and I know around the train station area all the wastelands have been built on now, looks rather posh, but I do not know if much has been invested in it since or how run down it may be now.
Even tho I have been away for some years, two of my brothers still live there and still love it. Plenty of pubs, restaurants, transport (neither of them use cars locally), shopping, things to do and the people around them are good - both of them get on really well with their neighbours, meeting for lunches now and then and popping cakes around on b'days, feeding cats while away, basically a nice community feel. However, another old friend tho said it has changed, it isn't so friendly as once was, she funnily enough blames Londoners, ha.. She has 4 children, from 12-22 years old and the eldest was in a little trouble at one stage, hanging around with the wrong people but to be fair, that happens up and down the country.
Personally speaking, if I could afford to go back I would live out in the Rottingdean area instead of main Brighton. Busses along the seafront are easy to catch and it's just a more peaceful area. BUT, I would move back in a heartbeat, I loved it there and there are plenty of worse places to live.
Edit: Forgot the hospital. It's terrible.