I honesty grew bored after reading the stories one after the other. Word of advice: only read one story at a time in between books. The best story was the first one which was by Rainbow Rowell. 
 "Midnights" by Rainbow Rowell: 5 stars 
 My favorite out of them all 
 "The Lady and the Fox" by Kelly Link: 2 stars 
 nope, just weird. didn't like it one bit. 
 "Angels in the Snow" by Matt de la Pena: 4 stars 
 I loved Matt's writing and Shy's voice. It broke my heart at times. 
 "Polaris is where you'll find me" by Jenny Han: 2.5 or 3 stars 
 What was that? 
 "Your Temporary Santa" by David Levithan: 4 stars 
 I thought this was super sweet and heartbreaking too. I really wanted to know what happened to Connor's family 
 "It's a Yuletide Miracle, Charlie Brown" by Stephanie Perkins: 4.5 stars 
 A fun read. I thought the beginning was slow (especially for a short story!) but I did enjoy it :) Though the insta-love wasn't that great. 
 "Krampuslauf" by Holly Black: 3.5 stars 
 I liked how Black addressed the divide between the rich and not so rich. However I didn't like the paranormal aspect at all. 
 "What the Hell Have You Done, Sophie Roth?" by Gayle Forman: 4.5 stars 
 Another one that began in a slow way.. and the university's name? weird. However I totally connected with Russell and Sophie. They were so cute together 
 "Beer Buckets and Baby Jesus" by Myra Mcentire: 3 stars 
 Yea i wasn't a big fan of this one. The main protagonist was annoying and I was bored of the play issue and how the main lead got together with Gracie (I think that's her name). 
 "Star of Bethlehem" por Ally Carter: 3 stars 
 This story doesn't work as a short story.. You needed more development that you have to witness for the whole story to be plausible 
 "Welcome to Christmas, CA" by Kiersten White: 4.5 stars 
 I loved this one. Very sad as well as heartwarming. I loved Ben's bubbly personality and his ability to predict what everyone wants to eat. Also loved the family relationship. 
 "The Girl Who Woke the Dreamer" by Laini Taylor: 2.5 stars. 
 This was a very unique story (between the 12 stories), however I was skimming through many parts. It was too long and for some reason I can never enjoy Taylor's writing. I did like the story but towards the end it turned into a cinderella retelling. Not a huge fan of that.