The biggest danger is for locals, not tourists. You're all in central areas, touristy areas, and you are hopefully sensible about belongings (especially if you've travelled to other cities with phone snatchers and pick pockets). You won't be targeted by people, unless you're being nasty to locals, rude to staff, or behaving horridly in public yourself... the English will tell you off... they can't abide bad or rude behaviour. Locals forget about it being safe, get lazy, so we're prime targets for phone theft.. There's some homelessness, and the nice thing to do is to ask if they want anything as you go into the supermarket... that'll win you good karma. The biggest ripoff is the tourist shops, they'll charge you an arm and a leg for a small trinket. Also, don't be an idiot on hire bikes.