Judging by these pictures it looks like these cracks have developed in the concrete and plastered surface over a period of time. My advice would be to use a crack filler compound and address the problem as soon as possible. If you allow these cracks to develop or widen even further then you would en...

My advice would be to go for the tiled flooring option. While the installation would require a little more effort, it would definitely make more sense as you could utilize the surface for other purposes. You could use a roff tile adhesive to fix the tiles to the surface. I have used it in the past a...