Marie's place is adorable and ideally situated. It's between the hip spots in the 10th and 11th, while also an easy walk to the Marais and the 1st, and on top of a bunch of metro lines. It's a perfect little one bedroom with a amazing view right on the plaza.
The only caution, which other folks have mentioned, is that it literally is right over the plaza, so if there is a protest or concert, it's super loud. But we were there over the Election week and while there were both concerts and protests, they were all reasonably short and over before we would have gone to bed anyway.
But we truly loved this place and can't recommend it enough.