The best. It is as good or better than some patisseries in Paris (although not better than this little place on rue de Seine in the 6e whose name I can't remember). It is better than Jules or Rahier, and much better than patachou, bonjour brioche, or anywhere else. Unfortunately, I prefer the tarts at Rahier (those at Celestin use crushed almonds or almond paste) although the item at Celestin with puff pastry, creme patissiere, and apricots is quite simply my favourite thing to eat, period.

No where else even comes close. My regular order is the Sofia, substitute the bocconcini cheese for mozzarella, although this is a personal preference.

It's very good. Grab a twisted puff pastry glazed with orange zest at Bonjour Brioche down the street, and then have an espresso at Mercury for an awesome breakfast. While Bonjour Brioche doesn't have the best pastry in the city, its proximity to Mercury is why I have included it here. If you can, grab a croissant at Celestin (NE corner Mt. Pleasant & Manor Road) and then head to Mercury. But even I am not that food-obsessed to do that... well maybe only once a month.