With neither lift nor room service provided our guests had to stay in dirty and shabby rooms on the 4th floor.

shabby 是形容词，意思是"破旧的、破烂的"，用来形容物品因长期使用或缺乏维护而显得陈旧、磨损的状态。这个词常带有贬义，暗示物品状况不佳或缺乏应有的维护。