I loved every aspect of my experience staying in Joanna's apartment in Le Marais. I was in Paris for a conference and then my 2 sisters joined me. Not only is the apartment large and cozy, the balcony is long and provides a beautiful view of the rooftops and churches. The neighborhood is so awesome! Delicious food all around (cafes, bistros, crepe stands...anything you could possibly want), and you can easily walk to the Louvre, Picasso Museum, Notre Dame, etc.
I can honestly say that Joanna and her colleague Caroline saved our trip. Joanna helped me arrange transport and was very responsive to all queries. She went on holiday while we are there and left us in the very capable hands of Caroline. My sister's luggage didn't arrive and we really struggled communicating with the airline and the baggage service; Caroline helped us get everything settled and was wonderful. They helped make our sister trip stress-free.