Maison Bertaux is brilliant. But it polarises (read all the comments here). For some it's rude, for some it's characterful. I believe it's the latter, and I'd forgive it anything because they do fabulous cakes and a lovely cup of tea.
It's the full pot of tea, strainer arrangment which makes you feel like you've had a bit of a ceremonial moment, without being too old lady and shortcake tea-room. It's a very good place for watching the odd bits of Soho go by, I didn't go inside this visit but I plan to go back. The interior is tiny and lovely (and probably too small and dark for me to take decent discrete pictures)
This flower sums it up. Nice. Elegant. And a tiny bit worn.