Im no networking expert, but just modifying the window hosts file to point my named virtual hosts to 10.0.2.2 achieves exactly what I am after: the ability to edit my files using VIM in Ubuntu, and see the changes take effect immediately Windows side.

I didnt got the 'seamless' route suggested in the article, instead I only went as far as installing the GuestAdditions which solved a few minor nitpicks, and everything is perfect now.