Like most companies, MR has all sorts of qualifiers on just about any statement they make. Generally, anything that can be billed to your room will be covered. Yes, there are exceptions especially where the service provider is not directly tied to the property (i.e. parking valets, laundry services, and some restaurants/gift shops). There is no definitive list that can be issued program wide and some may not be obvious when on site. Your best approach is to ask when there and take names just in case what they tell you is wrong (way too often).