I found myself with a group of 6 in NYC on January 30th with no plans for New Years Eve, and I was thinking I'd end up eating from a falafel cart, freezing in the street, or watching the TV broadcast from the hotel. Amazingly, Blossom saved the day by accepting our reservation for the following evening, where we languished over wine and the 3-course prix fixe, celebrating in the warmth of their romantic, welcoming little restaurant.
Service was attentive and accommodating, from the afternoon call to confirm our evening reservation to the kind atmosphere in the restaurant. Inside was a formal yet welcoming vibe with deep colors. The one drawback was despite a curtain separating the hallway from the dining room, drafts of the cold winter night kept coming in -- I noticed they had a heater near the door but that didn't stop us from getting chills! Perhaps a solid door at the hallway would be a good idea. I noticed when I went upstairs to use the restroom they had a few more tables tucked away there, out of the main dining room -- possibly a good place to host a group in relative privacy during a normal meal service.
I can't comment on the normal food menu since we chose from prix fixe for the holiday, but the wine selection was good. The food we had was interesting and worthy of a trip there, since I wouldn't make gourmet vegan dishes like that at home or find in other restaurants. They used Daiya and seitan along with nut creams to feature some "imitation" dishes like cordon bleu and cheesecake, as well as offering more traditionally vegan fare such as risotto.
It was expensive so Blossom wouldn't be in my budget for an everyday meal, but it was a wonderful choice for a special occasion and I'd go back.
Cons: Expensive, Door was drafty in the winter