I am renting a room and the house only has Internet downstairs. Wi-Fi is the obvious way to go but the room is in back of the house up stairs and long way from the router so Wi-Fi might not have the range and speed. I found the 2 Powerline adapters for $50, which is less than a good 11n router.

Actiontec - 500 Mbps Powerline Home Theater Network Adapter Kit - PWR511K01

Powerline offers stability and speed for my situation. Are there any other advantages of Powerline? Is it safe?

It should work with Win 8 is I decide to upgrade from 7, right?