Talleyrand was able to reframe the Congress of Vienna as a congress against revolutionaries, rather than a congress against France. He also let everyone else's issues (such as Poland) become more pressing, letting France to be a power broker at a discussion that was supposed to treat them as a defeated power.

While this is not "saving France" by any stretch (there was no serious push to break France apart), it allowed France to emerge essentially as it had been pre-war: as a Great Power monarchy.

However, one must ask whether France wouldn't have regained its stature as a Great Power anyway - no plan under consideration would have made it less than the 2nd largest power in Europe by population. It's kinda hard to relegate one of the most populous, economically powerful countries to irrelevance. The only way that could have realistically happened is if Talleyrand's proposition was correct - treating France as a defeated power might have left it unstable. The unspoken comparison would be Spain, who managed to turn itself from a global power to one that folded to France and only threw France out with the help of Britain's army and deep pockets - and who slid even deeper into irrelevance and poverty throughout the 19th century.

My personal opinion is that, hindsight being 20/20, Talleyrand's actions achieved their stated purpose, of keeping France (reasonably) stable in the near term. But in the long term, you could argue that France didn't have long term stability until after de Gaulle.