This is a great place to stay as has been mentioned several times. The metro is 1 minute away and all of the sights are either accessed there or many that you can walk to. One morning, I took a jog to Notre Dame and around that area. It was beautiful and felt safe.
Pascal is a wonderful host. He met us at the apartment when we checked in and provided recommendations for us to enjoy - sights, restaurants, stores, etc. It was like having a trusted friend in Paris while we were there. I very much appreciate Pascal.