I arrived to Rome first (Sam was estimated to arrive closer to 18:00). There were several ways to get to the main train station in Rome (Roma Termini) and I decided to just take the airport bus since it was cheap and our Airbnb was located just a few blocks from the station. The airport bus takes you directly to Roma Termini in approximately 40 minutes and it only costs €4. The other alternative is to take a (white) cab and while it is quicker, it will cost €30 one-way. A side note: One thing I learned was that “arcade” means “arches”. I was a little confused with the directions due to that minor misunderstanding and ended up wandering around a bit.
