how to get here
 
by foot: 1 minute from Metro station Alesia
5 minutes from RER station Denfert-Rochereau
15 minutes from train station Gare de Monparnasse
10 minutes from the Peripherique Beltway exit Porte d’Orleans

by plane: take the RER B train from either airport, Charles de Gaulle or Orly. 
From Terminal 1 CDG: after you leave customs look for the CDGVAL navette/tram/shuttle, departure level, exit 22, to Roissypole which is the RER train station into the city. 
From Terminal 2 CDG: take navette/shuttle or follow signs Paris par Train to gare TGV-RER.
From Orly take the navette/shuttle train which will take you to the RER station Antony.

the RER B brings you to Denfert-Rochereau station where you change to Metro #4 direction Porte d’Orleans to station Alesia. after you leave the metro, we are the first cobblestone passage  behind the back of the church.  
(9.10 euros one way from CDG, your RER ticket includes your Metro transfer.) 

if you have luggage we suggest you take the Air France bus. 
at CDG Terminal 1: exit 34, arrival level
at CDG Terminal 2A, 2C: exit C2
at CDG Terminal 2B, 2D: exit B1
at CDG Terminal 2E, 2F: corridor, exit 3
(16.50 euros one way, or 27 euros round trip.)
at Orly Sud: exit K
at Orly Ouest: exit D, arrival level
(11.50 euros one way, or 18.50 euros round trip)

take the Air France bus to Gare de Montparnasse. from there you take a 5min taxi ride. tell the taxi driver to take Ave. du Maine to 4 Passage Rimbaut behind the Eglise de St. Pierre Montrouge. taxis are right across the street from the bus station at the Hotel Pullman and should cost around 8-10 euros.  

by train: all train stations in Paris have Metro connections. look for your connection to 
Metro #4 direction Porte d’Orleans, take it to Metro station Alesia. when you get out, look for the church, we are the first cobblestone passage behind the back of the church. 1 metro ticket costs 1.70 euros, (12.50 euros for a book of 10), and includes all transfers within the inner city’s RER and the entire Metro system.

by car: take the Peripherique to Porte d’Orleans, head straight into the city, at 1km you will see the church St.Pierre Montrouge at Alesia, pass to the right of it, at second traffic light after the church turn left into rue Thibaud, after 30m turn left into the parking garage of 3 rue Thibaud. 
note: if this is your first arrival, be sure to call when you are at Porte d’Orleans, so we will be there to open the garage for you.

link to google map: 
http://maps.google.com/maps?f=q&hl=en&geocode=&q=4,+Passage+Rimbaud,+75014+14%C3%A8me+Arrondissement,+Paris,+France&sll=37.0625,-95.677068&sspn=30.957823,59.765625&ie=UTF8&ll=48.830091,2.3276&spn=0.006272,0.014591&z=16&iwloc=addr&om=1 

                                http://maps.google.com/maps?f=q&hl=en&geocode=&q=4,+Passage+Rimbaud,+75014+14%C3%A8me+Arrondissement,+Paris,+France&sll=37.0625,-95.677068&sspn=30.957823,59.765625&ie=UTF8&ll=48.830091,2.3276&spn=0.006272,0.014591&z=16&iwloc=addr&om=1shapeimage_2_link_0