The studio is lovely, it feels light and spacious. Sylvie went out of her way to make checking in convenient for us. Everything was clean. Le Marais is my favourite area to stay in Paris and this studio is such good value given this location. There are a few things worth noting but that didn’t stop us having a great stay: there are four flights of stairs to the apartment, the road is a fairly busy one but four floors up the noise was fine, the bed is a sofa bed but fine as far as sofa beds go, the shower is quite cramped so may not be comfortable for everyone.
That aside I don’t think you could do better in this price range so I really recommend this Airbnb!