If you mean "ideal":

Fresh air and open spaces
A viable infra structure (drains, pipes and cables, streets, roads and bridges)
Renewable energy sources
Buried utilities (no poles)
Lots of pedestrian ways and areas, parks and forests
Public transport that was fast, inoffensive and reliable and covered the whole city.
Large reliable supplies of water.
Plenty of sunshine.
A moderate climate.
A low crime rate.
Affordable houses.
Thriving industries which minimize pollution and recycle.
A huge recycling system. Ideally one that could completely recover basic chemicals from trash.
A cultural tradition of fine music and good drama and art.
An independent arts and music sector where breakthroughs, folk music, and experimental theater could occur.
A liberal and compassionate policy toward the homeless.
An adequate, honest, police force.
Plentiful local markets with locally grown fruits, vegetables and other foods.
A town-hall system or similar for making the wishes of the populace heard.


A