I had a great stay for 3 nights chez Marine immediately after arriving from the US. I was tired and jet-lagged and she made me feel at home and took time to speak with me (and even gave me a much-needed snack of bread and butter and cheese and tea). The bed was perfect for me -- very supportive and with a nice pad on top for extra comfort. My first night there I slept like 11 hours, the best I have in months!
I am normally a light sleeper but I slept well there every night. I should add that the bedroom, on the 4th floor of the building, faces onto a rather busy street, which has quite a lot of traffic noise, but when the windows are closed that reduces the sound a fair amount; I used earplugs and didn't have a problem with the noise. If you know that traffic noise is a big problem for you when sleeping, then you should consider that.
There are a HUGE number of restaurants and bars within about a 10 minute walk, plus you can shop at the Monoprix supermarket which is on the same block. And it is just a 10 minute walk to/from the Gare de Lyon.
This was a great Airbnb experience for me. I wanted to stay there longer, and I hope I can stay there again one day.