The housing stock is mostly Victorian, Edwardian and 1930s town-houses.
Almost true, although I think they might be combining the 1930s semis and the 1960s town houses. I am not aware of the 1930s housing stock being referred to as town houses.

...and there is a smattering of purpose-built apartment blocks from different eras.
True, from 1900s to 1960s and beyond.

Behind the Horniman Museum is an enclave of grand, detached private villas.
Probably Honor Oak Road, which is sort of behind the Horniman. I can't think of a better way to describe their geographic proximity to the Horniman.

I think it does us no harm to be in a column that has so far talked about Wimbledon, Herne Hill, Stoke Newington, Kennington, Hampstead, Mayfair, Blackheath, Cystal Palace, Finsbury Park, Southfields, and Marylebone. We are in relatively good company.

It could be worse....
http://www.newstatesman.com/society/2009...men-coffee