Tristan's place is in the heart of the 11th arrondisement. It's a very hip area, perfect for those who don't wish to sleep before 3am. There are parties and gatherings all over the place. The crepe place around the corner is opened 24 hours on the weekends! It's a short walk to the metro, and from there, the whole of Paris awaits you.
We managed to walk from the location to the Notre Dame, as well as the Place de la Bastille, so everything in the first through the fourth districts are walkable, although the first (the Louvre) would be stretching it.