We stayed at this apartment for a longer-term rental (3 months). It's spacious and in an excellent location in the 6th arrondissement along the river. These are really what makes the apartment attractive.
I normally don't write long reviews but in this case there are several important things that you need to be aware of: (1) The entire place has only 1 (one) small shared toilet and it is located all the way at the entrance of the unit away from the bedrooms; for you to know as it's not immediately clear from the listing; (2) The wooden parquet flooring in the living room is probably as old as the building itself (~100 years). While historic, it is not well maintained; it consists of small pieces of wood and many are missing and there are splinters. On top of these hazards, the floor is incredibly squeaky which can be heard throughout the apartment; (3) Host is not flexible with check-in time which is only late in the day after her work is done: 6-8pm. This caused difficulty for us arriving much earlier by long-haul flight with luggages and a baby. Host was not amenable to our earlier check-out either. Yes, we had a discounted rate, but there wasn't the smallest willingness to accept the change and return even a small fraction of the money; (4) Make sure you are aware of their list of additional house rules in French; see also review below by Valentin, December 2019. In case you wanted to enjoy a nice glass of French wine, too bad, according to the house rules "It is forbidden to bring alcoholic beverages into the accommodation."
I know the hosts really try to make staying at their unit an exceptional experience but they still have some way to go.