Harriet Display is a serif font. It goes well with Freight Sans, Harriet, Balto, Tablet Gothic, Georgia, Calibre, Alright Sans, Avenir Next and Scout RE. If you're thinking about using Harriet Display then try 38px for headers.
People commonly tag it as print, serif, swash, elegant, contrast, writing, blog, rounded, fancy and book. You can get it from Webtype.