This is a lovely little book. It's straightforward in its plot, making it easy to read. The prose and overall tone have a strange and peculiar feeling to them, but the book is short enough that it doesn't overstay its welcome. Perhaps best of all is the main character, Piranesi, who is a remarkably charming and adorable protagonist. The plot may be the weakest feature of the book, but the setting is definitely the strongest. Its descriptions of the ocean-drowned marble halls of the House are very vivid, memorable, and mystifying to me. 

What I love the most about the book, and what I took to be its most important message, is how it inspires one to remember to experience life slowly and notice the beauty that is everywhere in the world. The way Piranesi marvels over the architecture of the House, the Statues, the birds and the sea life -- and how meditative these sections of the book are -- reminds me that this is the way I want to experience the world more often. No matter how lonely I feel, no matter what the situation is, there is always some form of beauty in my surroundings. All I need to do is slow down and look for it.