Juanmata, I’m with you on improved file organization. There are feature requests dating back to October 2018 on this (Dashboard organization) and I suspect even older ones as well.
As for the storage location, although you can’t specify it from within the Coda interface, you CAN move all your Coda docs into a different Google Drive folder (or folders). I don’t personally find that super helpful, but it is possible.
JB