Beautiful dream. I love Paris, go there at least once a year, sometime more often. My stepdaughter lives there with her French husband, so my wife is trying to convince me to move there for retirement. But have you lived in a place where you don't speak the language? I have, here in Boston. English is my second language. Try it, and see how much you will like it then.
I am not challenging you by any means, just a making it a little bit closer to reality.
Currently living in Madrid and loving it - I don't know why I'd ever leave. Barely spoke any Spanish when I moved, picked it up since getting here ... helps that I have a decent head for languages and a bilingual girlfriend.
On the Photography front. I've carried a 24-70 (full frame camera, so adjust for crop) around for the past two years. For travelling, especially with company, I enjoy having just one lens and being able to carry the camera around the whole time. Actually looking at a smaller and lighter lens for this as well. Travel light and enjoy the city.