We had an amazing stay at Casa Pia. The apartment is lovely. It is very spacious and nicely decorated. When we arrived, we received a warm welcome and the place looked very clean and tidy. Pia is a great host, because she is very communicative and kind.
A trip to the center of Rome from the apartment does take some time (at least half an hour), but at 1 minute distance there is a subway station so it is easily accessible.
Overall, there is only one downside to the apartment, which is that the shower did not work optimally. The water got very hot or very cold and the shower head did not stay on properly. However, despite this I highly recommend this accommodation!