My girlfriend and I chose Marco's place as accommodation for our first trip to Rome.
First of all, Marco is a great host. From the moment our reservation was confirmed, we received a long email with details about how to reach the accommodation from the airport (shuttle, trains, taxi, etc), and places to visit (and prices for entrance tickets), great places to eat and even dishes to try. During our stay he or his partner was always available on phone for any information needed.
The apartment is very tidy and the pictures are accurate. The bed is great, really large and confortable. The kitchen has all you would need during your vacation stay and the bathroom is very clean. The only downside is that during daytime you don't get too much natural light in, but that's when you typically are out visiting so this should not matter. The apartment is situated in a complex with a nice interior garden, very well lit, safe and quiet.
Nearby you can find some minimarkets and some restaurants open till after 10.00PM and even later.
The location is very good as it is 5 minutes away from the Metro station and only a few stops away from the city center.
I would gladly come back to stay at Marco's place.
5 stars!