From Paris “Porte Maillot”:

From the Place de la Porte Maillot go towards Neuilly-sur-Seine
Take avenue Charles de Gaulle, direction “La Défense”
Take the tunnel under La Défense, and keep to the right in the tunnel
Take the A86 towards ”Saint-Germain-en-Laye”
Continue on the N13
Exit Rueil Malmaison, take the N13 towards
‘’Saint-Germain-en-Laye–Versailles’’
Follow: “Saint-Germain-en-Laye Center”
Arrived at the roundabout on Place Royale, take Avenue Gambetta
Turn right into rue Thiers

GPS coordinates: latitude: 48.898259
Longitude : 2.101023

The RER A is in direct connection with LA DEFENSE, AUBER OPERA, GARE DE LYON,
BERCY STATION and DISNEYLAND PARIS
At each of these stations you have direct connections with the Metro lines

From Roissy Charles de Gaulle airport:

Take the A1 towards Paris
Take the A86 towards Nanterre/La Défense/Saint-Germain-en-Laye
Exit Rueil Malmaison, take the N13 direction ”Saint-Germain-en-Laye-Versailles”
Follow: “Saint-Germain-en-Laye Center”
Arrived at the roundabout on Place Royale, take Avenue Gambetta
Turn right into rue Thiers

From Orly airport:

Take the N186 towards Versailles
Continue on the A86 towards Versailles
Take the A12 towards Paris
Arriving on the A13 take the exit towards Saint-Germain-en-Laye
On the N13 take “Saint-Germain-en-Laye Center”
At the roundabout take Avenue Gambetta
Turn right into rue Thiers
The Pavillon Henri IV hotel is a 3-minute walk from the RER A line