Ideal conditions for life Is Earth the perfect place for life ? If it isn't then how could conditions be better here ? For example, the size of the Planet, our atmosphere, distanace from our Sun etc.
It is a very good place for Earth Life, but that is because we have evolved and adapted to this planet. For example, we like to have an atmospheric pressure of about 1000 mBar, and a partial O2 pressure of about 200 mBar, which is exactly what the atmosphere provides.

Earth would be a very bad place for a species to which oxygen was toxic. A species that hadn't evolved here would probably find conditions challenging in one way or another.