The apartment is perfectly situated to visit all of the attractions in Paris. You have the option of walking or hoping on the subway conveniently located across the street from your front door.
As other commentators have indicated, the apartment is small! If you are traveling light, you will have some space to move around...but once you open your suitcases, floor space is at a premium!
Overall, the flat is a great place for two people to rest their tired legs after an amazing day of exploring all that Paris has to offer.