It really felt like an authentic Parisian experience, the walls were covered in books, the cupboards full of miscellaneous serving-ware. I don't know what mattresses they used, but they were some of the most comfortable I've ever slept on. Location was convenient, we were a 10 minute walk to the top of Sacre Coeur and there were at least four bakeries within a 10 minute radius (very important when you stay in Paris). The transport strikes at the time of our stay made getting to the sites at the center of Paris a bit of a hike, but because the weather was good we didn't mind. Google tells me that the number 4 metro line would have gotten us there very quickly without the walk. Overall I loved the apartment, I would highly recommend it!