Alain is an extremely nice, pleasant and kind host. His room I stayed in offers you a special view over Paris and it is somehow unbelievable that you can see the Eiffel Tower as well as Notre Dame and some other Paris highlights from there.
It is a good starting point to do Paris on foot. There is also a Metro station just opposite the flat.

You can ask Alain about everything considering Paris. He will always give you some insider tips of a real Parisian.
Besides Alain prepaires a fine French breakfast every morning which is a good start for the day as Paris can be really strenuous if you want to see all the well-known and maybe the other sides of Paris, too.

All in all: I really enjoyed staying in his flat and you should not hesitate, to do so, too! :-)

p.s.: If you travel by car, there is a parking garage just across the road called Salpétrière-Italie. You can book a parking space in advance at a favourable price via internet.