I lived almost all my life on neighborhoods of "walk up apartments" (3 or 4 floor high condo buildings without a lift, typically with 2 units per floor), and I

I lived almost all my life on neighborhoods of "walk up apartments" (3 or 4 floor high condo buildings without a lift, typically with 2 units per floor), and I agree completely. It is small enough density to be calm and quiet, but high enough density to support small local businesses at walking distance.