The key with Venus is to not land, but build could cities about 50km up. At that altitude, you have an atmospheric pressure of about 1 atm, temperatures are a bit above freezing, you still have the Earth-like gravity, and due to the atmosphere being mostly CO2 (a heavy gas), a balloon filled with breathable air will float. You've also got plenty of solar energy (during the day, at least). It's about as close as earth-like as you're going to get without actually being on Earth. On the downside, you have the 200 MPH+ winds to deal with, the lack of a strong magnetic field, as well as the long day/night cycle.