It is a good thing, the context implies it is a place where he or she has chosen to hide away. The idea of a chosen place to hide is "good" because the choice means that if it we're bad the author would not have chosen it.
Saying "hideaway from the police" would be an example of it being bad, because the police have forced the hiding.
Saying "hideaway from the police" would be an example of it being bad, because the police have forced the hiding.