I stayed in Petit Veneur apartment with my husband and the stay was great. Flat was clean and quite comfortable (a bit more comfortable then at the pictures). Very silent most of the time, because windows face the inner yard. But even if not this there won't be too much noise, this part of Marais is a bit distant from usual crowds on its streets and at the same time it's still Marais with all its charm and spirit.
Flat had everything that possibly you might need during the short stay, including normal kitchen, which is quite rare to find in studios and even in bigger flats in Paris.
As for Ludovic that he was the best host. We had trouble with our previous reservation on Airbnb, which was cancelled by the host a week before our arrival, so we needed help and immediately and Ludovic literary saved the situation. Yes, if we had time, probably we wouldn't choose this particular flat among other properties he has, but there was no time and no free apartments, so we just trusted his opinion. And he was right. He was always reachable by mail or messages, and his guy, Anthony, was very helpful in the offline world. That was really important because we needed to change the check in from one day to another: my plane was cancelled at the last minute. Anthony was always on phone (since Sunday evening till Monday morning), ready to change his plans to meet me in time of my arrival.
I'm really very thankful. And I definitely recommend to stay in this or other Ludovic's flats, because I'm sure that no matter what, everything will be fine and fixed and sure.