In the villas, there is a small vestibule area as you enter the room. Usually we place our empty luggage, extra water, etc. in that area. This could be a potential parking space for the ECV provided there is a handy outlet. There is also plenty of room in front of the kitchenette and bathroom area to park it once everyone is settled for the night. The tub/shower/toilet area of the bathroom is rather small in the deluxe villas compared to a regular room, but the vanity area is a nice size.
I know it isn't ideal, but I have seen many, many ECVs parked in the hallway outside the door of the occupants' room/villa. There is a good deal of space in a villa and you shouldn't have a problem locating a space to park the ECV at day's end. I know I have seen other posts where people are concerned that the ECV might be disturbed by other guests, but I have certainly never witnessed any tampering.
BTW, those sofa beds are comfy--I wouldn't dread sleeping on it.