I actually prefer travelling by bus when in Paris, but still maintain a healthy admiration and respect for the Metro. Admire the sheer feat of constructing such a complicated network under the myriad of streets in a very old city and respect the fact it moves around 5 - 6 million passengers per day and employs 15, 000 workers. There are 300 stations and never more than 500 metres for Parisians to walk to one !St Paul was the station we used mostly during our stay in the Marais. It is on Line 1 ( Yellow ) which was the first Metro line completed in 1900.
It is called the Kiosque des Noctambules ( "the kiosk of the night owls" - made for me !!)