solitude
The bolded word is most likely seclusion. Seclusion is the noun form of the verb secluded. When something is secluded, it is away from everything or everyone else. It is by itself. The word that best fits as a synonym to seclusion is solitude. Stay also seems as though it could work. However, it is not specific enough. A person's stay in a hotel or place doesn't necessarily mean he is alone. It is important to choose a word that shows the person is alone.
