Word/Open Office documents are okay, but not the best for steem articles.
The best piece of advice as far as editors go, that I've seen, is to download Atom text editor (available for windows, mac and linux) and install the Markdown preview plugin. In this way you can write your post with the Markdown you need in a steem post, and it will give a preview of how it will display in steem.
RE: Do Not Rely On Steemit's Draft Saved Feature