Rec, Nodame Cantabile: Finale Recommendations
Enjoy a romcom for an adult audience. Both animes feature an adult couple trying to make their mark in their industry (classical music and voice acting and marketting). Supporting each other, they go through a lot of personal and professional development. The interplay between these parts of their lives strengthen their relationships and makes for an interesting story.
The element of "under the same roof" adds to the comedy as well as drama. Both have a happy ending.