...Except that some 24th century models apparently have the warp core down there in the pod. Which may not have been the case in the original design, but the later redesigners apparently decided the pod was as good a place as any for a new, more powerful but also bulkier powerplant. This shouldn't hinder the use of the pod as an emergency-jettisonable section in any way, but it would complicate the idea of modular swapping of the pod for each new mission. Then again, such modular swaps might have been an original design feature but out of fashion in the 24th century.
I don't see the lack of windows as a damning fault for a crewed space. After all, most of the spaces in the primary hulls of 23rd century starships are windowless, and even the rims of the saucers have far fewer windows than would be structurally possible. Clearly, providing a direct view to space is not a pressing requirement in starship design.
Also, if we accept the scale of the Oberth at about 120 meters, two full-height decks in the saucer, then there are no windows in the saucer, either. Those shining dots on the saucer rim are some sort of sensors, then, or at most oddly placed teeny weeny portholes close to the ceilings or floors.
Timo Saloniemi