No special outlet needed, a regular wall outlet will work fine.
Depending on the room type and how many are in your party, space may be tight. On my recent trip I was in a 1-bedroom DVC unit with plenty of space for the ECV once I had pushed back some of the furniture. On a prior trip I was in a regular GCH room and the space was much tighter - it took a good bit of maneuvering to get the ECV in and turned around so that I did not have to back it all the way out when leaving the room.
I do recall occasionally seeing ECV's parked in the hotel hallways, plugged into an outlet to recharge. But I'm not sure if there are outlets (and space to park the ECV) close to every room. You might want to give the hotel a call to double check. As far as I know, the hotel does not offer the service/space to park and charge ECV's (the paperwork I got from Deckert's when they dropped off the ECV even mentioned this.)
No website that I could find either. But like many others who have posted in this thread, I've used Deckert's multiple times and have been very happy with their service.