Overall, the exterior of the house is French in style. I love the doors that flank the front of the house, but I am not such a fan of the front door itself. It has an art deco vibe to it, which normally I like, but I can't help but wish that the owner had stayed with the feel of the rest f the house.
To me, this is a beautiful room architecturally. I love the floor to ceiling doors (which are part of the front of the house), the high ceilings, the placement of the fireplace. If I ever build a house some day, I am going to use this picture as an example of one of my favorite rooms!
I have seen a wall of windows in some homes in California, and it has quite a contemporary feel to it. It is a bit contemporary for my taste, but I love the effect, and find it quite striking. Can you imagine entertaining in this room? On a nice night, you could have quite the indoor/outdoor party (the backyard looks huge).
The stairs have an art deco vibe to them, similar to the front door.
The powder room has that art deco feeling too. I love the mirrored wall behind the sink.
I don't really have a good feel for the flow of this house from the pictures, but it is fun to imagine how the rooms all fit together. Check out William Hefner's website for more amazing architectural and interior design.