核心问题
What are your fees for a room? 请问这句话的错误何在？
词典解答
fee是指付给团体的费用(报名费、学费、会费)和自由职业者(如律师、医生、家庭教师)的酬金。例如：
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The doctor's fee was higher than we expected. 医生的费用比我们预料得要高。
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The lawyer's fees amounted to a thousand dollars. 律师诉讼费计一千美元。
charge 则是指因某种服务而索取的费用(a fee that is demanded for a service), 如旅馆费、理发费等以及出售货物索取的费用：
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The charges for electricity and gas will be increased next year. 明年电和煤气的费用将上涨。
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His charges are very moderate. 他的要价不高。
据此不难看出,你所提出的病句应改为:
What is the charge (are your charges) for a room?