You can edit Word, Excel, PowerPoint and OneNote files in Office Online (on OneDrive) though anyway, for free and without needing Office 365 - just a Microsoft account of some sort.
It's not "optimised for touch screens" but it works in Safari on iPad, at least for minor edits.
I'm sure that the iPad-optimised apps will be better (possibly much better!) for more thorough editing/creating, but just in case anyone here wasn't aware and only needs to view and occasionally slightly edit Office files on an iPad, Office Online does work in principle. Of course I think that requires having your files on OneDrive, but there's also an OneDrive app for iOS, so that's doable as well.
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