I really struggled with a Y entry. There are no Parisian monuments that begin with Y (or none that I know of, anyway). The typical "Y" entries, such as yellow or yak just did not fit. I am not into haute couture, so Yves St. Laurent is not a viable choice.
I really wanted to share the houseboats along the Seine, however, and I thought.... YACHTS.
A brief google search confirmed my belief that this kind of Parisian living is not cheap. But... it is also not as expensive as other areas in town.
But oh... the views! Can you imagine waking up in the morning and looking out the window at the Musee d'Orsay?
Or perhaps going on deck and witnessing the sunrise over the Eiffel Tower?
Well, I can dream, can't I?