We visited the last week of June during a two week visit to Paris. It is not too far off the beaten path; easy to get to on the Metro and just a quick walk to the cathedral from the Metro stop. So much history, and tombs of most of the French Royalty. The church itself is wonderful with it's stained glass windows and architecture. The crypt is fabulous. We didn't use the audio guide, but spent a couple of hours exploring on our own. It is a historic, informative, interesting site that is definitely worth seeing.