The atmosphere of Venus, for what it is worth, is one of the most Earth-like places in the solar system. Breathable air is a lifting gas in the thick Venerian atmosphere, making floating habitats viable. Furthermore, at the altitude where the pressure is 1 atm and a habitat would stabilize (around 50km), ambient temperature is also in the range for liquid water. And even at this height, there would still be enough atmosphere left to provide protection from cosmic radiation.

https://en.wikipedia.org/wiki/Colonization_of_Venus#Aerostat...