"excluding breakfast" usually means excluding breakfast in hotel reservations. This usually means that you need to make your own breakfast instead of enjoying it in the hotel restaurant. As for whether Chinese food and dinner are included, it usually depends on the hotel's catering service and the type of accommodation and package you booked.

"windowless" doesn't mean the basement. A windowless room usually means that there are no windows in the room, only walls. This kind of room may be stuffy and the air is not very ventilated, so it may be cheaper than a room with windows. It is suggested to consider your own needs for ventilation and brightness when choosing a room, and make a choice after weighing the pros and cons.