My wife and I stayed at Nobu hotel for four nights in March in a Hakone suite. We quite liked the property and concept was great. Personally, I do not see the point of coming to vegas and staying at a property that does not have an in house casino. So the idea of a top end property within a larger casino appealed to us. Generally in the past we have been underwhelmed by suites at other vegas properties. The Hakone suite was both large but beautifully designed in an authentic contemporary Japanese style. As other guest have mentioned it was incredibly peaceful but right at the heart of Caesar's Palace. House keeping were great, they did an amazing job everyday.
The only downfall of the hotel was the front desk staff, both our check in and check out were a a complete shambles almost every thing we were told was incorrect (room not ready when promised, transfers not ready on time, several pieces of misinformation, no initiative to solve problems when things went wrong). The front desk staff right through are stay added very little value apart from looking pretty. When you stay at a top end hotel you want things to be seamless and efficient not frustrating. I am sure this will change as the hotel beds in over time but the service was so slow and misinformed that it made a great stay quite average.
Five stars for the hotel and concept 2 stars for the front desk.