My stay at Marjolaine's apartment was fine.
The location is very good. Close to metros, Saint-Germain-des-Pres and above all else the Jardins du Luxembourg.
The apartment itself was quite small. The mezzanine was laughable but perhaps, as a Canadian, I'm not used to such small spaces. It's important to note that you cannot sit up in the mezzanine, you must crawl like in a war trench and it is only accessible by ladder.
The sofa bed in the main area is okay but very stiff. It was fine for me but something to keep in mind.
The bathroom and kitchen were fine. Both were very clean.
Wifi was problematic for my friend and I but Marjolaine assured me that the issue will be fixed in the future.
I think this place is fine for two friends who are traveling or a family with young children. I think four adults would find the area too tight.