It would be safest to wait for Microsoft to issue a statement about compatibility with Mavericks (or a patch if needed). They wouldn't do that until sometime after the final release is out.
That said, I'm impatient, and it's been working fine for me. Haven't had an issue with any of the 4 Apps.
Office version 14.3.6 here and all works perfectly. There was a time when all the PowerPoint slides were upside down but that got fixed by Apple early on in Mavrix development.