The big problem with Mercury is that it’s actually very expensive to get to in terms of energy, hence why we’ve had very few missions to it. On the other hand, Venus is a surprisingly good candidate. While it’s hellish at ground level. There is a layer of upper atmosphere that has effectively Earth like conditions in terms of temperature and and ambient pressure. And you have a ton of volatiles in the atmosphere that could be harvested. So you could technically build cloud cities there. The main problem is that the atmosphere is fairly corrosive, so you’d need materials that wouldn’t degrade in it.
The big problem with Mercury is that it’s actually very expensive to get to in terms of energy, hence why we’ve had very few missions to it. On the other hand, Venus is a surprisingly good candidate. While it’s hellish at ground level. There is a layer of upper atmosphere that has effectively Earth like conditions in terms of temperature and and ambient pressure. And you have a ton of volatiles in the atmosphere that could be harvested. So you could technically build cloud cities there. The main problem is that the atmosphere is fairly corrosive, so you’d need materials that wouldn’t degrade in it.
https://www.bbc.com/future/article/20161019-the-amazing-cloud-cities-we-could-build-on-venus