Me Grande Arche de La Defense, then bus 258, or RER to rueil-Malmaison, and then walk.
In the Me Grande Arche de La Defense take the bus 258 or the RER to reuil-Malmaison, then from there you walk.
You can't take the bus 258 from Me Grande Arche de La Defense but you can take the RER to rueil-Malmaison but from there you take a taxi.