It was referenced in the Times Dining Out section 1 1/2 weeks ago, but I couldn't find a reference to the modest cafe called "Crepes" in the Sony Building's Plaza space.
The Times wrote up a cake this place is selling called "Semla" -- a sort of cream puff/brioche with cream and a touch of marzipan -- which is made in the time of Lent.
I'm here to tell you it's beautiful. I'm pretty sure the cream isn't sweetened, so the effect is understated, but the more memorable for it.
If that doesn't seduce you, they do other fine baked things too, such as:
A cookie filled with something like creme brulee (I've never encountered anything like it -- very rich, but very interesting)
A Princess Cake (layers of sponge cake and apricot topped with whipped cream and a layer of marzipan)
Danishes (of a much more genuine sort than you've probably had in a long time if ever: flaky crusts, real ingredients)
and Croissants (extraordinarily buttery ... possibly too much so, but judge for yourself).
They also sell Illy Coffee.
I've been back several times and haven't found shortcomings yet. And the owner/operator couple are very friendly as well. I hope you'll agree.
The Sony Building is between 54th and 55th on Madison.