I envision them as semi-spherical, domed with a metamaterial that can selectively reflect light (on very bright worlds, the dome would produce an opaque circle in the direction of the sun(s)), with a beautiful Terran environment with, and living and working spaces underground in the bottom half.
Good idea. The space should be economized in the cosmic habitats. The "City" should be placed underground and designed as a single huge building with built-in transport system (Arcology). In the "roof" of the "city" there is a recreation zone - artifical landscape with parks, rivers, lakes, and an opaque dome that allows one to observe the sun(s) and sky. Landscape probably may be morphed sometimes. The space habitats should be designed for rotation, like in A. Clarke's "Rama".