If you want to live center and in a typical Roman flat during your stay then I highly recommend Nikolas apartment. A very polite host with a stylish and great located place with only 5 minutes walking distance to Pantheon and 10-15 minutes walking distance to Fontana Di Trevi. Just across the street in a small corner, you also find a cozy bar called L’Osteria all Pantheon Roma which I highly recommend!