How does the manga compare with the anime?

I recently finished watching this series (season 1, in case a season 2 ever happens and someone reads this post in the future ;) ), and I was wondering how well it adapts the manga and whether there are any significant differences? I know that the anime doesn't cover the complete manga, and I'm not really asking about the volumes/chapters not covered by the anime. I'm more curious about how well it adapts the volumes it does cover, and if there are parts it missed?

Mostly I'm asking because I enjoyed the series, but I felt that there were details left out, or things that could have been expanded on. For example, I would have liked to see more of the other tenants in the apartment building, or more information about Shiori's family, people and island.