We had a lovely stay at Marco's place. We were two families of three on our first trip to Rome and everything couldn't have been better. The apartment was a lot more spacious than expected,fully equipped (kitchen utensils, electrical appliances,bedsheets,it even provided umbrellas for the odd rainy days in Rome) and perfectly located! The metro station is about a 5min walk but you can practically walk almost everywhere from there (the Vatican Museums and Saint Peter's Basilic is just across the street, Trastevere is a lovely 25min walk by the river, Campo di Fiori right across the river as well as Piazza de Spagna and the rest of the sights). The neighbourhood is very safe and pleasantly busy. The apartment is in an awsome old building overlooking the Vatican. Lots of lovely places to eat around and a supermarket very close by. (My daughter and her friend want me to include in this review that they loved their stay and felt at home in this apartment!) Highly recommended and definitely good value for money.
Hope to come back soon...