In love with the city
The city is filled with history, music and art to its core. Walking through the main area, you will see lot of historical things. Although the walking tours are costly, you can recreate the experience by using Audio guide on your phone and using GPS through the city. Vatican was a bit of a downer but the rest of things including Trevi Fountain and Piazza Navona were charming.
Insider Tip:Don't use public transport - walk and walk a lot!