The apartment is really very close to the Vatican, the apartment is on the 4th floor of a bigger complex. Since there's an elevator we had no problem with our baggage. We arrived by car and used a parking space 500m away where you can leave your car paying 4€ for every 8hours. It's free on Sundays and during the night. There were no free parking areas close to the apartment.
The apartment itself was great for 2 adults and 3 kids. Enough space, well equipped kitchen and everything clean. Even a washing machine was available.
We started our daily tours through Rome from the apartment by foot. We needed 5 minutes to the St. Peter's Basilica and something like an hour to the Colloseum. The rest of the attractions is basically on the way.