A generic upping of every aspect of your security could be on the books if you intend to stay at that flat.
I would have a good guess ( my experience at work ) that you are looking at about 95% of theft from vehicle, burglary and other silliness to be connected with druggies. Which means that even when the drug addled drains on society are off their rockers, scoring drugs nearby, their radar will be up and running on what looks shiny.
Nice little indicators for ripe hunting grounds for vehicle theft are little piles of glass strewn along the parking bays where windows have been put through, poor street lighting, walkthoughs into parks and alleyways ( unobserved access and escape routes ), fences/walls/foilage stopping a direct line of sight to your vehicle, the sounds of one ot two mopeds slowly riding past the parking bays in the wee hours etc.
There is quite a bit you can do as passive defence that is not obvious and more importantly does not land you in the shite when it comes to wounding a trespasser....much to my annoyance, Ap-mines are not a legal deterrent.So if you have a garden with fencing for example, I could post a few tips.