I liked Navigation 21, "Yuubinya-san," because I agree with its message.
Navigation 22, "Cunzone," introduces Atena. She doesn't say much. I like that.
Discovering the night town with Al, Akira-san's intensive training, and the Cafe Florian stories were all very enjoyable. There are some amazing art works in these chapters.
Basically, there's a lot to like about this series, but there are some weaknesses as well. I have faith in director Satou Jun'ichi to bring out the best from the original work.