I can't imagine a better location, a more fun apartment, or a better host than Sebastien. Really. Walking in any direction right out the door is a treat. The apartment has numerous cafes, bistrots, and restaurants within a 3 minute walk. And Rue Vieille du Temple, among others, has lots of excellent restaurants, fashionable boutiques, and great side streets, like Rue des Rosiers, where people line up for crepes at a little opening in the wall. I didn't really check the time, but it's less than a 30 minute walk to Rue de Rivoli and Notre Dame.
Equally important, Sebastien is a great host. I had mentioned that it helped my sleep to have a really dark bedroom, and when I arrived I found he had put in a special blackout arrangement on the windows. It's worth mentioning that the apartment is also very quiet because all rooms open to an inner courtyard. But if you want a view, climb up to the little roof garden and you can see as far as the Pantheon.