Found this guide very handy on our recent trip to Paris. I would have given 5 stars but I found that the maps within need to be in a little more detail with regards to road names as it is quite easy to get lost. Other than that would recommend.
Bought this offline, but wanted to put in a word for how good it seems to be. Really neat little pocket size (about a large slimline diary), pretty detailed little maps of relevant areas, a fold out map at the back. OK, there's stuff that has to be left out, but it's nice to have a guide that's going to be up-to-date on prices, opening hours, latest changes etc.. Particularly handy for Paris given the French aversion to websites.