Getting the materials to build floating cities onto Venus would require mass transportation of materials through space; i.e., in a practical sense, asteroid mining on a large scale. If we can do that, which would require a signifigant longterm human presence in space (or self-replicating machines) then we'd already have plenty of habitats to choose from. Deciding to live on Venus would be a vanity project of sorts. (Not saying it would be bad, just no major motivation to do it. Although vanity can be a pretty major motivation )

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"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
"The Mayan symbol for "book" looks a lot like a triple hamburger, but I've never seen them claiming it as proof the Mayans had Big Macs." - KaiYeves
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort