I highly recommend this apartment. First of all the owner, Maria, contacted me immediately to make sure we coordinate a few days before my arrival. She also helped me set up transportation from the airport to the apartment. This was extremly helpful as I was traveling by myself with 2 young kids. I met with the owner at the apartment and was given detailed instructions on how everything works. I was also given a recommendation for a nearby restaurant that was perfect for me and my kids.
The apartment itself is well furnished, great size (very large) and well equipped. There's everything you need to cook and relax (great patio).In addition there's ac in all rooms (vital during our stay as temperatures in Rome reached 36 degrees celsius).
Last but not least is the location. The Colosseum is within walking distance (about 10 minutes with 2 young kids). Once there, you have access to line b of the metro (Colosseum station). The apartment is also very close to the Manzoni metro station that gives you access to line A which stops at the Vatican and Piazza Spagnola among other places.
The area in which the apartment is located has several mini mart stores, a tobacco shop (tabacchi) and a few gelato stores.
To summarize, great apartment, great location, and wonderful responsive owners.