I used to live maybe a mile away. Had our bikes nicked from our garden shed in 8.5 years and that was it in all that time. I did a lot of walking in the local area and know most parts within 5 miles of my old house extremely well. Never felt unsafe particularly in that particular part of Plumstead - it's not near Woolwich or the high street. I'm hardly a hardened Londoner - I grew up in a ridiculously middle class village in Cornwall so believe me if anyone was going to feel unsafe there it would be me. Wouldn't want to live there but that's because of the hill!
Those statistics linked to are for the whole of Greenwich borough not just Plumstead. Greenwich borough contains several deprived areas, including some not far from that house but like most parts of London, you don't have to go far to see a total contrast in areas. Greenwich borough has crime stats no worse than any other London borough with obvious exceptions.
I don't like the doors, they're too ornate, look like they'd get scribbled on easily and are a bit of a faff frankly 