Simone's place was located in an amazing spot. No more than a 10 minute walk from Roma Termini, and on a side street with less traffic (cars or otherwise). I was about a 15 minute walk (or less) from many great tourist attractions as well as great places to eat!
Simone was super helpful about finding the place (gps ended up with me a few doors past), and had some great tips for staying in Rome.