This is the closest metro station to my apartment in Paris, and I have taken it every morning to go to work in La Défense. Usually on weekday mornings the trains are already pretty full by the time they get to Argentine, but a lot of people get off between Argentine and La Défense (especially at Porte Maillot) and there's reasonable standing room. Line 1 is also a mostly automated line, so the trains come very often and service is uninterrupted during transport strikes (although the trains get much more crowded).
This metro station is also a very short walk from the Arc de Triomphe, so convenient if you want to visit that. There are 2 exits, each of which spits you out on either side of the multi-lane traffic of the Avenue de la Grande-Armée, so I'd pay attention to the best exit, although it's not hard to cross if you pick the wrong one. The exit "rue des Acacias" is best if you want to go in the direction of the place Saint-Ferdinand/Ternes/17th arrondissement.
The station is reasonably clean, although there have been a few times where I've gotten off at the far corner of the platform and caught a whiff of urine. One time I had an issue with my Navigo and the woman working at the guichet was helpful and polite. Overall, a good station from which to access the 16th and 17th arrondissements, and the Arc de Triomphe. read more