We enjoyed our first visit to Paris and found Nathalie's place was well-located and comfortable for us all. I brought my two daughters (19 and 21--both 5'2") who were able to climb the bunk ladders and fit easily into the beds, but I would not recommend them for older (or tall) people. Nathalie's apartment is a great size, though, with us all having a room to ourselves and a comfortable living space to be together.
There was a funny smell in the apartment when we arrived and it took a while for us to get used to it, but other than that we all agreed it was the perfect place to stay while in Paris!