Great location to reach all the main sites. We did everything by foot. For public transport a little less accessible maybe, but have to say we didn’t even try as everything is easy to reach on foot.
The apartment is on the 3rd floor, there is an elevator available. The apartment is in a hallway with another 3 apartments. We never had any problem with noise of any of the neighbors. The apartment is on the back of the house and also on a pretty quiet street, so noise not an issue in general.
The apartment is comfortable and has all the basics you need. The beds slept really well. Bathroom is really new and shower was nice and powerful. The furniture is a collection of vintage stuff combined with some more new items, not super cosy, but fine for the amount of time you spend there in the end.
The roof terrace is on the 5th floor and is shared with the other apartments. It was nicely decorated and had multiple seething areas with plants used to give some privacy.
From the airport, it’s faster to take a taxi. We informed for the train, but they advised to either take a shuttle bus or taxi. As the taxis have fixed prices for airport to center rides (€48 and €2 per suitcase), it is almost as much as the train + bus when you travel with more than one person, but train will take you a lot more time!
A little tip is the coffee place around the corner, called Sant' Eustachio Il Caffè. Classic with a lot of history. Really great coffee and pastries to get the day started. Drink at the bar and you pay less than if you take a seat on the terrace (as is pretty standard in Rome). You order at the pastry desk and go to the bar with the receipt.