Just made my res. with them today, we've used them twice before for our son who has autism (4). They are great sitters, usually a bit older and female. I think they advertise that every sitter is a mother and usually even a grandmother (not positive about this). The business is small (probably home run) and very low tech (no website). You just call the number given on the allears site and make your appt. When you check in you call them with your room number. If you do a search on in-room childcare I think you'll find a lot more information as well.
As of now the fee is $16/hour with a 4 hour minimum and $12 travel fee.