Federico's place is very clean, and has all the amenities you need for a short stay in Rome with a family (we had 3 children with us). The location is second to none - it is situated very close to the Colosseum - only about a 3 minute walk away. The apartment's location is also very close to several different types of public transportation.
The apartment has a Netflix account, which is nice, especially to entertain children when not out exploring the city.
Federico himself is very friendly, and offers great tips on local restaurants / supermarkets. In addition, he booked airport transports for our trip - that was a great help!