Sentence:  A thing of beauty is a joy for ever: / Its loveliness increases; it will never / Pass into nothingness; but still will keep / A <WSD>bower</WSD> quiet for us, and a sleep / Full of sweet dreams, and health, and quiet breathing. 
Meaning of the word marked with <WSD> tags:  A dwelling; a picturesque country cottage, especially one that is used as a retreat.