Poetessa was formerly East Post. Two disclaimers/things you should know: yes, Poetessa just opened a few weeks ago, so this is jumping the gun a bit. And I had never eaten at East Post.
The overall experience was disctinctly mixed. We were seated quickly. The room has a cozy, warm feel (though seated next to the windows, the temperature wasn't always warm). I ordered the black linguine with squid; my date ordered the bucatini with lobster. Our server was a young woman, very pleasant if a bit formal. She said both of the dishes we had ordered were among the best on the menu.
But when the food arrived, it wasn't exactly what we had ordered. We ended up with lasagna and the bucatini, which we took in lieu of waiting (the wait hadn't been long, but we were hungry). The lasagna was delicious -- lots of bechamel, and the meat sauce was nicely spiced, maybe with nutmeg. The bucatini was bland, no other way to describe it.
The waitress then recommended the tiramisu (the kitchen had run out of our first choice, an apple cake). I rarely order it these days, since it's everywhere & not frequently well done, but on the strength of her recommendations (I should have learned my lesson by now), we got it. The cream tasted like it had gone sour -- basically, it didn't taste fresh.
The waitress took half off the lasagna, and despite the lackluster bucatini & dessert it wasn't a bad experience -- maybe because the lasagna was that good & the ambiance was pleasant. But with so many good Italian choices in the EV, why go back?