As far as I can see, that is what is being referred to here, and this is the term I have encountered in similar advertisements for luxury Paris properties.

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Note added at 15 hrs (2008-10-29 07:21:13 GMT)
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Strictly speaking, yes — a 'corniche' may, for example, be found round the top of fitted kitchen cupboards.

However, in my experience, the word 'cornice' in UK English (= seems to be what is meant by 'crown moulding' in US English) is very often used to refer specifically to the type of moulding that runs round the angle formed by the walls where they meet the ceiling in a room.

And equally from my experience in FR adverts, the word 'corniche' is often used (somewhat imprecisely) to refer to this same feature. Note that 'moulure' is also often used, again, a more general word, but taken in context to mean 'moulure (entre parois et plafond)'

I think it's just important to bear in mind that the 'crown' in the S/T refers to its FUNCTION (it 'crowns' the wall, just like a 'cornice'), rather than making any reference to its actual FORM.


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Note added at 16 hrs (2008-10-29 07:36:26 GMT)
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If you had any lingering doubt, a quick Google search reveals many instances of the word 'corniche' used to describe this kind of 'cornice', and being used by experts in the business who would surely know what they are talking about!

Here's just one very simple example:

http://www.bricoleurdudimanche.com/Fiches-Bricolage/reveteme...