We stayed at Pierre's apartment for 5 days. It is a great location in Paris. It is in a quiet neighbourhood in the 15th arrondissement. Despite this, all sites were easily accessible. The Eiffel Tower is 20 minute walk away. Other sites like the Notre Dame, Louvre, Musee D'orsey are about 20 -30 mins away by metro (similar by bike/scooter).
The apartment is small but very well laid out with lots of attention to detail. The bathroom is very functional with lots of storage and a washer/dryer. There is also lots of storage around the apartment for your belongings. The kitchen is fully stocked and a full fridge/freezer. There is also a coffee maker, however there are lots of nice cafes very close by.
Be mindful this apartment is on the fourth floor. We didn't mind the stairs, but this may not be for everyone.