A wonderful apartment - very stylish and absolutely spotless!
The Metro station is a 5min walk away and from there you can get all around the city within 10mins. (It is not in the centre but with everything so spread out around Rome you will have to travel anyway!) Tickets for the metro are €1,50 each for one trip anywhere so would probably recommend getting day passes if you are wanting to hit all the sights.
Emilio is a kind, friendly host with quick communication. Would definitely recommend.
Please note that Italy requires all tourists to pay a tax of around €8 per traveller/per day and to provide passport photos too.