A south-facing room & lots of windows is a plus, but cacti & succulents don't really want to be houseplants. It is possible, but you might lose lots of plants in the learning process. Good luck!

Congrats on the new place!

If you do end up putting those jades on the book case, keep watch on how they grow. If they start to stretch to the light, don't hesitate to move them to a brighter spot.

It took me a while to "figure out" the best places to grow different plants around my place (which I am still figuring out). The light from each season is very different and there are subtle ways I found to help, such as opening blinds in a certain way or opening different doors to let additional light in.

Took me about two years to realize that hey, my plants don't look as great as they used to!

Succulents (like jades) and cacti are pretty forgiving plants for new homeowners... if you get busy and forget to water they can at least survive for quite a while (typically). And if they are in the worst conditions, it is usually possible to cut/replant them to start over.

I wonder if the light from windows reach the top of the bookcase...Don't forget, the intensity is much lower thru the windows than outside, and distance would cut down on it drastically. You may end up with etoliated plants. Do you mind posting a photo?
Rina