John is a very attentive host and will offer you any information and assistance you need. We went to Rome for a concert at Atlantico Live and the location was good for us (about 30 min walking distance from the concert hall and sage neighborhood - which is very useful if the concert ends late in the night). The room is very quiet and close to the metro station.
The only disadvantage was that the expandable sofa bed was squeaking at every little move :) - I suggest to make an investment and change it - and that in February it was a little bit cold in the room (so people traveling in the colder months should pack some warmer sleeping clothes).
All in all it was a nice experience in Rome and we thank John for all his kind advice and pleasant attitude!