I can only presume you live in sunny climes Hettymaud.
I can imagine nothing worse in our cold dull weather than living in a room with with echoing tiled floors, so cold on the feet. I have wooden floors through out, but plenty of rugs everywhere, which can if necessary be put over a line and beaten.
But if you are all so worried about germs on floors, what about sofas and upholstered seating? All those bottoms with various levels of cleanliness and various levels of clothing between them and the upholstery, not to mention potentially naked bottoms and babies and toddlers! I presume you have unapolstered chairs you can wash or wash the seat coverings daily.
Dear, oh dear, those pesky germs get everywhere.