The location of Andreas' apartment couldn't have been better. One can walk to all the main touristic points, but one of our favourite things to do was to just get lost on the streets surrounding the apartment - they are all so beautiful and you can also just "bump" into the Pantheon, Piazza Navona or Campo dei Fiori.
I have read some reviews complaining about natural light. Indeed, there's little light coming in from the windows, but for us it was not a problem. In fact it helped for our sleeping quality, since the apartment is dark and quiet.
Communication and check-in were smooth.