Thanks for the replies.
I think the staffing agency has a deal with Marriott, and the account execs find the airport convenient. For daily work, the commute is not convenient (car, bike, ...), so then the client has to fix the accommodations.
There is a newer extended stay hotel in Harrison (Element) they used before, so I am moving there today. It should be a much easier trip to the office in Newark, and to New York on weekends.