We thoroughly enjoyed our stay at Alessandra's apartment. It's in an excellent area that's central to pretty much everything a visitor would want to see in historic Rome. There also are some great restaurants in the area. Our hosts were very responsive and accommodating about check-in and check-out. Everything went very smoothly.
I read in another review that there was no elevator, which was not true. The unit is on the second level (1st floor) and there's an elevator right outside the entrance. The apartment overlooks a fairly busy street, but the windows are well insulated and noise was never a problem. It's also a very secure building and a safe neighborhood.
A couple other things to note... The living area is pretty small with a older couch and a small dining table with 4 chairs (1 was broken). So it's not great if you plan to spend a lot of time hanging out in the apartment. (But then why would you if you're visiting Rome?) The kitchen is more of an "efficiency" kitchen with a small fridge and microwave. It's well stocked with glasses, plates, etc. But it's not a full kitchen so don't expect to cook full meals there. Also, in another review I read that you should bring extra bath soap and shampoo because very little is provided. That was good advice. But don't worry if you need to pick up food or other things. Right across the street is a market and a pharmacy. There's also a taxi stand conveniently located across the street.