This is an interesting part of London!
When I visited London back in January, I made it a point to visit the area known as Shad Thames on at least a couple of occasions. It's an old industrial warehouse area and in my opinion it is quite awesome! I strolled through here during both daytime and at night and found it equally beautiful both times of day. There are some shops and eateries but mostly it seemed somewhat empty (although that could have been that it was January).
It's right by the Tower Bridge, which everyone visits anyway, so if you are going be sure and swing by here. It's on the south side of the River Thames, just off the bridge. Ask around and you can't miss it - and you will be glad you strolled through here! Oh and bring the camera! :-)