This seems like interesting offer. Is it sold around easily?! Or there is a special place to buy such key? (as far as i understand its just like usb device that provides internet connection) Have you used it yourself?Have a look to Intenet Keys; in this period Vodafone is making interesting offers with discounts. Have a look to the website of Vodafone (it)
It not easy to find a connection when you rent a flat, since the connection goes with the phone's company that you choose for the house. Much better using a Key; you can use it everywhere!