Marta's place is excellent if you want to enjoy Rome for a few days.
The location is, from my point of view, the best you can choose for a short period of time. It's surrounded by bars, yet no sounds can be heard at night and it's 10-20 blocks away from the main attractions of the city (Vatican, Colosseum, Trevi Fountain, etc).
What felt really uncomfortable about the apartment was the number of steps one has to climb in order to get to the entrance. It's around 64 steps, so clearly not for everyone. Apart from this, we had an amazing stay :)