I have never had any sort of a problem with a Marriott facility which is why I stay there whenever possible. Their locations are wonderful, the staff is more than just courteous, and the facilities are clean, comfortable, and inviting.
This hotel made me feel welcome: The very first thing they did was to offer me a price I couldn't refuse. Then they found a non-smoking room for me without my having to ask. They simply assumed I didn't smoke a first in any hotel, except Marriott. Marriott employees in general bend over backwards to make anyone's stay as pleasant as possible.