I've lived since 2 years in a flat managed by
Acorn and I'm totally thrilled and happy about the service & care they provide. Fast and professional, a far cry from what I experienced with several other letting agencies (most don't give a damn). Apparently, they "only" operate in South London of which Greenwhich is a really nice borough to live.
Recently, Thamesmead has quite risen as a new living area in London with reasonable rents and mainly new home developments. It's close to the Thames and apparently's got nice river views.
Harrison Ingram is a letting agent operating in this area.
I'm quite happy down south here, I lived in north and east London (west unaffordable if you don't like flat sharing

) and if I had to choose moving within London, it'll be south again (it's also closer to the coast!)

t.