Private tours?
 

Planning just a few days in Paris this summer and would like to arrange a private tour to all the touriststy usual suspects. There will only be two of us.

Any recommendations?

I arranged a private tour with Paris Walks. It worked quite well.

You may want to look at Heather Stimmler Hall & Secrets of Paris

Private tours?
 

Context Tours has small groups and I believe can do private tours as well. I did their tour of Musee D'Orsay (review on philatravelgirl website as well as a Paris section) and it was led by Art History scholar with only four of us.
I'd also throw in if you are game for a different type of walking tour to visit the street art as its amazing in the neighborhoods that most tourists rarely see - it's a highlight of my many visits http://philatravelgirl.com/paris-street-art/