This was a fascinating tour through an essentially unknown part of Paris: the arcades or covered passages full of shops that were created during the 19th and early 20th century. Our guide was very knowledgeable, and his descriptions were interesting and vivid. He provided a lot of architectural background and economic context for what we saw, and that added a lot to our enjoyment.
He was very empathic with our hearing difficulties, and was very tolerant and helpful when we were delayed and had to find the tour via a text message stream. The route was carefully planned to provide a continuing series of interesting stops and experiences, and we ended up going back to the area to explore it further on our own.
(The tour has extended walking, uneven surfaces, and some steps, so guests with mobility difficulties would probably not enjoy it despite the quality of the presentations.)