The apartment is located out of the way from Rome center. Right across the street is a market with everything you may need for snacks. The apartment itself is very spacious: large bedroom with shower, a good sized living area, and a small but efficient kitchen.
Equipped with everything you may want, even electric converters from US to European outlets. A large flat-screen TV, about 50inch, to begin learning Italian.
Overall, we would have spent more than double the rate staying in a hotel room half the size.
Around the corner are several restaurants. Our favorite is Il Ristorante, just half a block away around the corner.
We thought we were to far from city center and would need to take cabs. However, we soon discovered a bus stop, just two blocks away that drops you off at the metro, Bus #280 or #301. The Metro Line-A is at stop Lepanto, which is just one stop from St. Peters and two stops to the Vatican. If you do need a taxi, there is a taxi stand near the bus stop. Called them at 5:00AM when we leaving and they were there in 5 minutes.
To get to the Colosseum, you take the Metro Line-A to Termini, main train station, change to Metro Line-B and fifth stop is the Colosseum. Literally outside of the Metro station door.
Other attractions you can decide by taking the Hop-On Hop-Off bus.
You can't do better. Thank you Christian for being a gracious and considerate hostess. Thus far the best experience we've had with AirBnB.