One concept that came out of the Congress of Vienna was the Principle of Legitimacy, which restored lawful monarchs to power after Napoleon was dethroned. This solved the problem of who would rule after Napoleon was kicked out because it put Louis XVIII back on the throne to rule. This pleased Metternich because it went along with the conservative idea that they wanted an absolute monarchy. Appointing Louis XVIII back into power gave the French people just enough power so that they wouldn’t revolt again. The impact of the Congress of Vienna was that Napoleon was no longer viewed as an enemy, and there were also no wars between the major powers in Europe until 1853. The Congress could not stop revolutions forever though, as there were many uprisings that eventually led to Metternich fleeing Vienna and losing his power.
This is a picture of King Louis XVIII (http://fr.wikipedia.org/wiki/Louis_XVIII_de_France)