Piergiorgio's flat was every bit as beautiful and clean as the pictures show, and more. It is very nicely furnished and you even get a chocolates and sweets bowl.
The host himself is extremely accommodating and a genuinely lovely man, along with his family who live next door.
Whenever there was an issue (hairdryer causing the fuse to blow, or dealing with taxi drivers in Italian), there was always somebody available to help.
The flat is on a quiet street and within walking distance from St. Peter's Basilica (about 15 minutes). A trip further into the touristic centre of the city however (Pantheon, Colosseum etc.) may require a taxi journey on a hot day
I would highly recommend it to any couple visiting the city.