The 1100/month flats I saw were in calm, green, solidly middle class areas with walking distance to several large parks, shops, and great transport links.
This [1] and this [2] suggests Croydon is about halfway down the borough list per capita, with matched better what I remember from looking at Met numbers in the past. Croydon is the second most populous London borough, so in absolute number of crimes it is usually high up the list, but per capita it's for a long time been pretty much middle of the road, again pulled up by the poorer parts of the borough (particularly, as far as I remember, the Northernmost parts most urban parts, and estates like Addington and Fieldway.
[1] https://www.finder.com/uk/london-crime-statistics#london-cri...
[2] https://www.mylondon.news/news/west-london-news/most-violent...