It was very easy to communicate with Carlo from the beginning. We were received by Gabriela who was welcoming us with a big smile and showed us around. The flat is well equipped, we had everything that we needed. It's a bit dark inside as the flat has only one window on the door (looking into an internal courtyard), but we didn't spend much time in the flat during daytime so this was not a problem. We were 5 in the flat - I wouldn't say that we had too much space but anyway we could be accomodated in the heart of Rome for a very reasonable price, so for a couple of nights it's absolutely fine. The location is perfect, many main sights are in walking distance and further sights can easily be reached by bus as plenty of them have bus stops nearby.
Great value for money, I would absolutely recommend this place!