The flat smelled very stale, of cigarettes, when we arrived, including the bedding. A few hours with the windows open helped. We couldn't sleep on the mezzanine as it was too cramped, and hot in a heatwave. The sofa bed was fine though. The host was welcoming and the flat is in a great location, in a labyrinthine courtyard just off the canal, in the midst of the bars, restaurants, etc. yet really peaceful. We took bottle of wine down to the canal side and had a lovely evening. So not the most comfortable place we have stayed but a real Parisian experience