Kevin's apartment is pretty much of what is described. Extremely well located in a quiet neighborhood, which is ridiculous safe to walk even late night.
Louvre, D'Orsay, Tuileries and the Siena river, and many other interesting locations, are near enough to be reached on foot.
The single concern to have in mind: do not underestimate the power of the stairs. Is not the worst physically demanding challenge for most of people, but it demands some extra energy after a full day of touristic activities.