Closer to 5 than 4 stars. The meat in one dish came out very overcooked, so we sent it back, and they apologized.
Other than that, the dishes were excellent - unique in construction and tastes. Overall, there's more Peru than Japanese in the dishes (with some Korean ingredients (gochujang).
The drinks were pretty decent, too.
Service was pretty good - everyone was friendly. Our somalier took a while getting to us, but that was a minor hiccup.
I've eaten at a ton of LV restaurants, and with all the new offerings constantly popping up here and there, it can be difficult to revisit the good ones, even for someone who goes a few times a year. That said, Once is definitely on the "revisit" list.