Even if you have a smooth floor, I would still consider doing case tumbling in the garage and doing the media separation outside. The lead compound residue accumulates in the media and you don't want that dust in the house, children or not.
I do gun cleaning on a workbench in the garage, too. With the door open, the fumes don't become a problem.
The reloading operations are located in a spare bedroom, as you are suggesting. They aren't that noisy and they don't make fumes. Spilled powder is easily vacuumed up. I have a tight weave carpet, so primers are easy to spot. I don't think I would want a shag carpet, as that would be too much of a challenge...
.30-06 Springfield: 100 yrs + and still going strong