Size: The population of Córdoba is roughly 325,000 people full-time making it Spain's 11th most populated city. Add in the anxiety inducing amounts of tourists that visit every year and the city could very well feel a lot more crowded.
Public Transportation: There are public buses that run routes through the streets of the city that they can fit through (not beside the Mesquita/Cathedral or in the Jewish Quarter). That being said, I did not use the buses as the city is easily managed by walking.
Places Of Interest: If you find yourself in Córdoba and don't experience the (#1) Mezquita aka The Mosque-Cathedral, you've made a grave mistake. Showing the religious changes of this complexes nearly 1,500 year history, is a combination of Islamic architecture, with Hellenistic, Roman and Byzantine touches, is perfectly combined with Christian architecture. Truly, you might never see anything else like it around the world.
The monument to the mixture of these religions and kingdoms dates back to the mid-6th century with the construction of the San Vicente Basilica by the Visigoths. The Moors arrived in the early years of the 8th century and eventually built the original Mosque from 786-788. It was enlarged twice more, once in the 9th century and finally in the 10th century.
Then the Christians recaptured the city in the mid 12th century. From there they dedicated the site as a Catholic temple and work was started in 1489 on the main chapel. It was finally finished in 1607 and has since been known as Villaviciosa Chapel.
As you can see in the pictures above both the Islamic and Christian elements are stunning.
(#2) The Jewish Quarter (La Judería) is a must visit when walking the streets of Córdoba. It's in the heart of the city just a mere block or two from the Mezquita. La Judería is in exceptional condition. Its thin streets are home to countless arts and crafts, jewelry, and souvenir shops that are owned the operated by locals as well as bars, cafés and restaurants that are frequented by locals and tourists alike.
(#3) The Roman Bridge & The Bridge Gate is nothing special except for it standing the test of time. I mean, seriously, THE ROMANS. It's a long bridge that can give you a few neat views of the river and the wildlife that calls this area home. You're walking on ancient history. Might as well appreciate it.
My Thoughts: If you love, and or, can appreciate history, Córdoba is a perfect fit for you. It's a small city that will not overwhelm you with what you can visit. A day trip from Seville (40 minutes by train!) is my best advice. If you're feeling ambitious, you can possibly spend a night in Córdoba. But, again, it's not a large city with a ton to do. Anything more than a day or 36 hours in Córdoba and you risk running out of things to do. No trip to Córdoba is complete without visiting the Mezquita which is a very popular destination which means tickets get booked up quickly and in advance. It's advisable to get a ticket to the Mezquita for a day that works for you and then booking your transportation to the city and, if you're ambitious, a place to stay for the night.