Claudia and Marco are amazing hosts! I guarantee you will have an enjoyable visit to Rome if you stay with them. The photos don't do their apartment justice - it is much prettier in reality. The guest room is even better than it looks like in the photos. Their terrace is huge, and overlooks the area - a great place to relax after sightseeing and to enjoy meals. You have access to it from the guest room. My stay with Claudia and Marco was incredible - I really felt like I was visiting relatives, they took such great care of me. They made sure I had everything I needed. The apartment has VERY easy access to the metro - the Cornelia stop is literally across the street, so it is very easy to get to virtually any place you would like to see in Rome, for only €1.50. The area is safe, and allows you a glimpse at real life in Rome, a great place to go to at the end of the day after being in tourist-populated areas. The building itself is newly renovated, very nice, with an elevator to take you up straight to the apartment. Claudia and Marco have registered their B&B with appropriate authorities, so you can rest assured that everything will go according to plan.
All in all, I am definitely going to stay here again when I come to Rome (hopefully Claudia and Marco still have a B&B then!). For this price you will not find a better place to stay in Rome, and even if you pay more, you will not have as enjoyable an experience. Don't look around more, book your stay now!