Pros: easy communication, fun and centrally located neighborhood, beautiful and quiet apartment (the apartment was perfectly quiet despite being located on a busy street). If you're interested in being truly in the heart of le Marais this is a wonderful apartment.
Cons: there is only one - we did not like the showers: there are 2 bathrooms - the one downstairs is a true shower but the water got only comfortably-warm (not hot), the upstairs one is a bath with a handheld nozzle that got hot but was impossible to stand in if you are tall (over 5'10").
Overall we had a wonderful stay. The location of the apartment made for a great experience in Paris.