The apartment we stayed was really nice, spacious and clean, it has 3 bedrooms and 2 bathrooms. It was big enough for 6 of us. Our host Maria Rita was really nice and welcomed us in the flat when we arrived. She explained everything and even gave us a map of all the things we have to visit.
Just outside the block in the same building, next to the entrance there was a store where you can buy food and cook yourself or you can just go to some of the nearest restaurants. The location is very good. It's about 15 min walk from the Vatican. There is a bus stop just across the street, so if don't feel like walking, you can take it to the center of the city. The nearest metro station is about 10 min walking. We walked all the time without taking either the bus or metro and we saw everything we planned for 2 days, even more things than we expected to see. The historic center of Rome and all the sightseeings are within walking distance, so you don't have to rent a car, just if don't like walking so much, you take the public transport. We took a car from the airport, which wasn't exactly a taxi, it was a bigger car for 8 people and it takes 15 euro per person. And this was cheaper than taking the transport from the airport to termini central station for 14 euros each and then taking the metro and then walk for another 10 min to the flat which we didn't know exactly where it is located. So for more people it's cheaper to the this car, which is just outside the airport, next to the taxis. The same driver offered to take us back to the airport when we leave, so we didn't have to call a taxi or take another transport. It took us about 40 min from the airport to the apartment with just a little traffic.