It can look amazing if you get a contractor who is an expert at doing these floors.
Another thing to think about is possibly adding radiant cooling and heating within the slab. Your house will be comfortable year round.

We use concrete flooring often. The first thing to consider is whether the final finish is the actual slab (tricky but less expensive) or a veneer layer applied afterwards (better control of results and more expensive). Here is a veneer finish over concrete by Artisan Finishes called Milestone.

what concerns me more are the cracks when the house begins to settle, what can be done in order to avoid these cracks?

Usually the sub-floor slab is reinforced with re-bar, or more commonly fiberglass filaments they call Tiger Hair. Of course, the more reinforcement, the fewer the cracks. If you opt for the veneer coat, they use a polymer instead of water to mix the concrete, thus making it a little less prone to cracks. There are usually expansion joints built in to the slab as well.

cracks in concrete more likely come from uneven or accelerated curing, settlement from an inadequate sub base (use. good gravel base on untouched earth) or inadequate control joints. Use a good contractor.