While browsing apartments yesterday for our June trip to Paris I came upon http://www.vrbo.com/my/60117. I actually got a call from Jim Braude who owns some of the properties and manages others. very helpful and friendly. What sets them apart from most of the other outfits I have researched is that they don't require a damage deposit and they take American Express. This gives me much more confidence that I won't get ripped off and will have at least some recourse if there are problems.
We booked #156039 and I'll certainly let everyone know how it goes.