We use app/assets/views because it will go through the Rails asset pipeline and be compiled in to a single asset bundle. Depending on the size of your app, this is likely perfectly acceptable.
I'd recommend keeping the two domains separate to avoid any confusion moving forward. Also, it's important to note that our most recent version of batman now separates app/assets/views and app/assets/html. /views is used for view classes when you need to provide custom functionality surrounding the view. /html is used for html templates with batman js markup.
Does that clarify anything?