Luca's apartment is close to Roma Termini (about 15 minute walk) and the Cavour subway station (3-4 minutes away), which can take you to the Vatican after transferring a line. There are markets, restaurants, and not to mention the Colosseum in the area! Although I did not meet Luca in person, I was provided with the resources I needed (maps, taxi service, restaurant recommendations) to enjoy my stay in Rome.