Affordability for a lot of suburbs is when you allow for degrading infrastructure and moving more and more towards bankruptcy of cities. Budget analysis for a lot of suburbs show very troubling trends. In essence, living in a properly maintained suburbia is not affordable. Too much street, pipe and wire per capita.
Cleanliness - it's only in appearance. The dirtiness is externalized to the environment by means of CO2 and other emissions due to personal transport. A lot of concrete and asphalt being poured require massive excavations and destruction of nature elsewhere. More than cities.
Quiet is also externalized - cars are extremely noisy and suburbia basically requires a lot of 4000 lbs metal hunks with mostly a single person inside.
Privacy is there, but it costs quite a lot in total societal costs.