We loved the location of the apartment! Campo di Fiori is nice and we loved the convenience of the market so close. We didnt have to use the metro or any public transportation because we ended up walking everywhere and taking taxis back. Colosseum is a 20 minute walk with the Emanuel monument(altar of the father) many churches, Palatine Hill and Roman Forum in between. Vatican City is also a 25 minute walk with Castel St. Angelo on the way.
The apartment is small and clean but there was enough room for the 4 of us. The pull out couch was surprisingly comfy. The bathroom is just as tiny but it worked. Upon arrival we did not have cash and we were able to leave the city tax in the room when we departed and we are entirely grateful for that! Our host was friendly and nice and met us right on time!