The town of Nozawa Onsen could not be faulted in any way or form. The accessibility from Tokyo is easy especially by the Hokuriku Shinkansen (Bullet train) from Tokyo after the Narita Express train from the airport. So you disembark just after Nagano at the nearby Japan Alps township of Iiyama and then either a bus or taxi to Nozawa Onsen.
On arrival you can see this is going to be a special experience. I arrived on the Tuesday prior to