A great apartment. Very quiet even though it is in the midst of Marais. Extremely clean and spacious. Beds comfortable. The only issue is that Merveil - the host which is a company - asks for a huge guarantee of 2000 Eur which compares to a 400USD/night and we only stayed 2 nights. This seems out of proportion and they were not flexible on it.
Furthermore for the guarantee you are asked to do it on a external website - not airbnb not Merveil.
In the end everything worked out fine but you never know and so to have 2000 Eur blocked somewhere is not very pleasant.