The location is unbeatable, literally in the Pantheon. Lively, safe and tourist neighborhood, a lot of noise outside (which I don't mind at all), lots of restaurants, gelatterias, souvenir shops.
The apartment is great, very clean and offered all the amenities we needed, comfortable sofabed.
The only minor downside was the shower, which needed a little bit of patience to work, but in the end we managed to take good showers. The secret is not touching the buttons that control it in the bathroom.
I strongly recommend Mariapina's place!