We (2 adults, 2 children) stayed 10 days in Silvia's apartment. And actually, there is nothing negative to say about the Casanova. The apartment is brand new and everything you need is available. It is located quite near the centre. With the metro and the bus you are in no time in the middle of the city. We also liked a lot the area around the flat. You are actually living with the locals and so you get a feeling of the real life in Rome.
And with Silvia and Andrea, you have very lovely hosts who are always ready to help and give you tipps. They are very nice, helpful and friendly.
We loved it and will certainly come again next time we stay in rome!