We were met by Sandra's associate, Emma, a wonderful hostess who spent almost 45 minutes with us explaining use of the apartment and giving us very good restaurant and sight seeing recommendations (especially the walk up to Gianicolo Park for a view of the city).
As for the apartment -
Pros: Very clean, spacious, comfortable chairs and bed, lots of closet space, close to all amenities (many restaurants, ATM, food market, pharmacy, bus and tram), centrally located to all major sights without being on top of any of them making for a less hectic neighborhood, pocket Wi-Fi which had very good signal strength throughout the city.
Cons: About 100 feet from a very busy road. Lots of traffic noise during the day with the windows open. Not a problem at night. Air conditioner is in the bedroom only and I doubt it can cool the entire apartment. This was not a problem for us since we were there in cooler weather.
The apartment is above a restaurant but, remarkably, you can't hear any noise other than the occasional loud talking (usually well lubricated) patrons leaving the establishment. Again, not a problem at bed time.
We highly recommend this apartment and would definitely return there should we have the opportunity.