To put simply, the characters are great!!!! I think the plot can be a bit slow moving and a bit repetitive with the -prince has a bad trait-> Heine helps to fix said trait->Heine acknowledges prince for who he is->everyone gets closer- in the beginning but each episode focuses on the adorable personality issues of all the characters and Heine has a past himself that we dive into.
I don't think the art is anything too spectacular, but there is definitely nothing wrong with it and this anime's focus isn't to have the most beautiful scenes in anime. The focus of this anime is character growth and it is definitely meeting that goal!