I live further north in enfield, I've never seen an area of islington that's what I'd consider nice, expensive yes, but just because something is expensive doesn't mean it's good. Then again, enfield has some crap areas too.
I worked with a woman in her 60s about 10 years ago, sounded straight out of eastenders, told me how some car dealer sold her son a cut and shut car. He then went on to have an accident in it not too long later where they realised, he was very lucky to be alive. She said her sons and husband went back and took him for a little ride - smashed his knee caps and left him in a field. It must have shown on my face that I thought she was joking so she then proceeded to justify it. That made me feel like I'd just entered eastenders.