PT Serif is a serif font. It goes well with Source Sans Pro, PT Sans, Proxima Nova, Roboto, Eina, Poppins, Alternate Gothic No. 2 D, Montserrat, Abril and Fira Sans. If you're thinking about using PT Serif then try Give 18px a shot for content.
People commonly tag it as agency, design, portfolio, magazine, quote, food, elegant, classic, decorative and blog. You can get it from Font Squirrel, Fonts.com, Fontspring, Google Web Fonts, MyFonts, Typekit and YouWorkForThem.