Key West did not get the damage to infrastructure that the islands just to the North did. Big Pine 30 miles North took a direct hit from Irma
I have not been to Key West since the storm. I have been to Key Largo where they are back up and running.
The Cruise Ships are stopping into Key West again, so downtown is open for business. I have heard that most of the hazards to navigation have been removed or marked. By November most of the debris that might be a bother for navigation should be have cleared out. If you have a particular marina you were planning to stay at I would call them. If you are coming in November you will just miss Fantasy Fest, which is scheduled to happen. You can see for yourself the level of "open for business" at the Sloppy Joes web cams Live Duval Street
If it were me, and the marina I was planning to stay at was open, I would go.