My apartment is a charming 500 sq ft on the 6th floor (no elevator ;-) in an ancient building from the late XIXth century with one bedroom with a regular bed and a futon sofa-bed in the living-room.
It's very central (1 minute from subway station), right above the Canal St Martin (where the Movies 'Hotel du Nord' or 'Amelie Poulain' takes place)
is one of the two biggest subway station in Paris: from here you'll be able to reach all the important places with metro or busses without transit. (you'll be 15' walk from the very historic center Ile de la cité and 5' from le marais)
here's a map of the close neighborhood :
(Website hidden by Airbnb)
The flat has a washing-machine, dish washer, WIFI, expresso machine, freezer (in other word everything you need to live there ;-)
I'm often down at the third floor, and would be delighted to insure you the best advices (places, bar, restaurants) during your stay! (there's a couple of amazing ones all around)
well, you're expected !! ;-)