This place is amazing :) Apartament its so nice, cozy, very clean and climatic.
You can find there everythngs what is necessary like in your own home. Location is perfect, its 3 minutes from the Metro and 10 minutes from Colosseum, from fountain di Trevi its about 20 minutes by walk. Everythings you can visit just by walk and if you would like to go to Vatican its 10 minutes by Metro :)
In the flat is really comfortable bad. Its city centre so it can be a little more noise. There is a basic shop downstairs and italien bakery a few steps away.
One suggestion , Massimo he is not speaks English well , so its better to contact with Elizabeth his daughter. And when you came to Rome just use the gps and you will find this place without any problem :)
If I will going back to Rome for sure I will stay again in Massimo's apartment :)