Gian Paolo himself welcomed us in the flat, showed us around and he even had prepared a bowl of fresh fruits and a starter-spaghetti-kit to make us feel at home - and offered his advice and help whenever we should need it. He was also very responsive due every e-mail sent before the journey and sent us maps how to get to the flat, sightseeing spots, bank, supermarket, etc.
The apartment is located in the Monti area in the city center (but still very quiet), all sightseeing spots were easily reached on foot and the area has many great bars, cafés and shops. The apartment looked exactly like on the fotos. We were also glad to have air conditioning in the apartment as it was unusually hot for the Middle of September.
There's nothing to complain: great host, great apartment, great location, great city.