Frank & Soledad's house matches what is described. It is very comfortable and had everything we needed for our stay. It is only 5 minutes from Termini Station.
It's also close to the city center, making it easy to walk to some of the main attractions. If you want to go by public transport, the house is very close to the metro and bus stops (three minutes walk).
Frank couldn't get us, but he left Andrew's contact. He gave us all the support we need. He also gave us useful advice of hidden places to visit (see some graffitis and drink some wine).
Rome is a capital city full of treasures to discover! I highly recommend Frank's house for your trip.