Marvin's place was perfectly located in Paris. Residential area with lots of shops and restaurants nearby, and a quick Uber or metro ride to just about anywhere you want to go.
The courtyard was perfect for the kids, and the space was just big enough for our family of 3.
There is no dresser/drawers or walls between the bed areas, so plan accordingly (with packing cubes, etc) but it wasn't an issue for us.
Shower head was detachable and shower big enough for a parent and child, so the lack of bath was not an issue (if your child is not old enough to fully shower themselves).