The conference is taking place at the Center for Information and Neural Networks. Please see here for our guide to travel: http://cinet.jp/english/contact/.
There are several hotels you can stay in, listed below. If you want to choose a different one, the two best places are either Senri-Chou, or Ibaraki, both of which have a number of business hotels.
1. The Senri Hankyu Hotel
More to be added soon....
Things to see and do around Osaka:
If you have some time before of after the conference, there's several things to do such as visit Minoh Park (very close), or travel into Osaka city centre (Namba), or take a train to Kyoto.
Some ideas are here.
2. The Hankyu Exopark