He observes that the breakfast is very harmonious, cozy, safe, and comfortable.
We can arrive at this answer because:
All these elements are presented in paragraph 8, which allows the reader, as well as Billy, to believe that this will be a very good place to stay, as it feels completely safe and comfortable. However, both the reader and Billy were mistaken, as this place was very dangerous.
This question is about "The Landlady" and you can get more information about this short story here:
https://brainly.com/question/25658352