Extremely great location if you are looking for a vibrant part of the city. At least a dozen bars and cafes within a 1 minute walk. The entrance to Les Helles train station is less than a minute away so it is easy to hop on the RER to travel to/from CDG. Notre Dame is close and many other attractions are walking distance.
The apartment was a good size and the terrace was very nice. Surprisingly quiet given the bustling neighborhood around it. Would recommend!