Great location as it was quite a quiet and non-touristy part of the city, 15 min walk to metro station and 1 min walk to a bus stop. We found some very nice restaurants, cafes and bakery on the walk from metro station. Also very close to the Vatican. Would also recommend taking a walk up the huge hill behind marco's apartment, there is an amazing viewpoint where you can see across the whole city!
Marco was absolutely lovely, he contacted me well before our stay, and when we arrived he waited outside the apartment for us, despite us being an hour late! He was also very easy to contact if we had any problems, although we didn't spend much time in the apartment anyway as we were out exploring!