I had absolutely no negatives with this apartment.
Everything worked perfectly and the apartment is just as you see it in pictures. You have absolutely everything you need for a short but especially for a long-stay. All the appliances are new and easy to use + there's a Nespresso machine and plenty of storage and close space! I was there for a total of 12 days.
It is 4 stories up with no elevator, but that's clearly explained and the apartment is worth the trek, and the stairs are big enough to take a big suitcase up and down. The building is quite well maintained and quiet. The neighborhood is a treat with everything you need close by from supermarkets to dry cleaning. Equidistant to 2 metro stations (Saint Paul and Bastille). It's a 10 minute walk so factor that in if you are the for work.
As for the service. It was my second apartment with Ludovic and all worked perfectly. Communication is always clear and the person who checked me in walked me through everything and made himself available in case I needed anything.
I would definitely recommend this or any other of Ludovic's apartment, particularly for business travelers trying to avoid small hotel rooms.