The apartment is extremely well located and a great option for walking around Paris or for taking advantage of the subway network (a subway station is literally 2 mins away).
Certainly, as mentioned in other comments, the apartment is not big, yet it is very clean and comfortable for 2 people and for a short stay.
Mathieu - the host - is very responsive and he proved that he deserves the high score and positive comments that has been rewarded so far. During our stay we only had a minor inconvenience with the manager supporting the lease. That said, Mathieu promptly intervened to ensure that this would not happen again.
So, in summary, a great place for our nice visit of Paris.