It's gorgeous. I want to find out too!

From further investigating (by looking at the close up shot on Anastasia's website) and just the scale of the print my opinion is that the walls and ceiling are actually painted. In the close up on her site, you can see brush marks in part of the black/grey section close to the ceiling pendant light. I couldn't imagine trying to install wall paper with such a big graphic up the walls and up to the ceiling with all the different corners. Painting a graphic pattern like this would be the easiest and cost effective way.

If you are interested in having something like this done in your own home, one of my contractors is a decorative painter/faux finisher. Let me know.

It's beautiful, I LOVE it too.

Thanks Mark, it probably was painted....I've just seen some HUGE graphic wallpapers...or "bespoke" wallcoverings/murals printed on wallpaper with the same scale designs and thought this was possibly one of those wallcoverings like found with Sandersons Interiors

This question is from such along time ago! However the answer is yes, the design on walls is a hand painted wall mural. It was done by a local decorative painter here in SF.
Thx!

@Faiella Design, it's never too late to answer the question 4 years later. It's nice to know that it is hand painted.

Okay great!