I live in an house.
I walk 5 minutes to the nearest bus station, there in the worst case, in public holiday I may have to wait 30 mins at most, but because the bus hours are public, I can leave my house at the last moment.
10-15 mins with the bus, or 8 if there are no car jamming the road, I'm at a train station.
This train station have a train line that bring me in the middle of Paris in 13 minutes.