It depends on whether the tiles are the property of the unit owner or common property, the strata plan should tell you – if they are not common property it would be noted on the plan. It can vary from strata scheme to strata scheme. If they are common property, then the obligation is on the OC to fix them, but if you ever wanted to change them you would have to get permission.
That is assuming they are the original tiles – if an owner has subsequently changed them then usually they become the responsibility of the owner.
In the case of a villa I would expect the tiles to be the owner’s responsibility but I could be wrong.
Check with the strata manager or have a look at the strata plan.