We stayed in Marta's apartment for two nights during our spring break as students from Paris. The apartment suits those who are looking to explore Rome on a budget. But if you can spend an extra 20 € per night, it is well worth your while to stay closer to the attractions like the Colosseum and Roman Forum. Marta's apartment is an about 30-minute taxi ride to the sights and isn't in the best location. Look at a map; there's nothing to see near there. There is nearby public transportation, but sorting that out can prove difficult when you're eager to see Rome and not its underground.
The apartment suited our basic needs, but was by no means lavishly comfortable. Any added extras you might enjoy or arguably need, like laundry and Internet, are not available. When we arrived, Marta showed us how to access the apartment's Wi-Fi, but it did not work. She said she would come back the following morning to fix it for us, and she did come back sometime while we were out, but the internet never worked. As students who rely on Wi-Fi to contact our families and friends, this was a sore disappointment for us.
On the whole, just be wary of the apartment with a slight mosquito problem in a graffiti-decorated building that you're about to rent.