Maple floors and millwork are less common now, because maple doesn't take traditional wood stains very well. But they were super common back in the day. You will find maple millwork and floors, in older homes, especially in the east and mid-west.
Fortunately, staining maple is no longer a problem if you use reactive stains. I mean, just look at this millwork! This is a great project for old and new wood. Not to mention, reactive stains are super easy to use.