One neeed not lift floorboards, or drill through floors and ceilings to run wires. What I have done in my apartment, and what friends have done in their houses is run the wires along the base or tops of walls, tucked out of the way. Then one need not worry about pets or vacuum cleaners getting at the wires to chew them up, or getting tripped up by wires laying loose across the floor. There's a 100' meter limit for copper cables for ethernet. In my experience, that's plenty for most homes and offices, even when running along the walls.