This is only because I am a light sIeeper: I had a room on the ground floor by the entrance, so it was a little noisy and the curtains do not block out light completely, so I found it difficult to sleep.
Everything: the staff is really polite and helpful, the room was super-clean and tastefully decorated, the bedsheets smelled nice, the bathroom was spacious and comfortable. There was a kettle, tea and coffee in the room, a fridge with mini-bar, fast free wi-fi, energy-efficient lights. I was travelling through Paris, and they even let me leave my suitcase until I come back from a trip to Italy. The location is great. The owners communicated before, during and after my stay to ensure that I had the best possible experience.