It all depends on the hallway, but one time when I was in WDW (I forget which hotel) there were two scooters parked outside a door along the hallway. This was not only difficult for the Mousekeepers, but also for other people with wheelchairs!
It was an older hotel (I think the older part of SoG), and I had to actually get out of my wheelchair and have my dad lift it over the scooters. If I did not have this option, I would have had my dad unplug the scooters, put them in freewheel, move them to the end of the hallway, let me by, then push them back towards the right doors.
Also, if housekeeping needs those outlets to vacuum hallways or other reasons, they will simply unplug the scooter.
Unless the doorway is physically not wide enough (which in some of the *accessible* rooms in the Hilton DTD is it not), please bring the scooter into the room to charge it. Especially in a Villa, there is plenty of room. Disney will remove furniture from the room if you need them to (a chair, table, even a bed if you need it replaced with hospital equipment).
In a room at CSR (a moderate with a roll in shower, which means smaller bed room), I was able to fit a powerchair AND a manual chair, with all the furniture, with no problems.
And while one scooter may not be a fire-hazard on its own, several can be, or one could be placed in front of something important, like a fire extinguisher or emergency stairs.
It is entirely possible that your scooter will be messed with by people less well-meaning than hotel staff and other wheelies. I have seen children climbing and playing on scooters left in hallways in the past, and it would be very easy to throw a scooter into freewheel, steal it, then get a key made for it later. Scooters are not cheap, even used on eBay.
So for your own safety, the convenience, and the safety of those around you, PLEASE bring the scooter into your room at night to charge.