A superb place to stay in Rome. I stayed 3 nights in Valerio's place and didn't encounter any considerable issues with it. Highly recommended.
I did not meet Valerio as he was not available during that time. He arranged for his friend, Lorenzo, to assist with the check-in and check-out. Lorenzo was most friendly and helpful. He was very understanding when I missed the train I was supposed to take from Florence to Rome and ended up arriving at the apartment more than 3 hours after the planned check-in time (sorry again about the inconvenience caused, Lorenzo!!). Upon arrival, when I had difficulty pinpointing the exact location of the apartment, Lorenzo went out of the apartment to look for me and led me to the place. He gave a thorough guide of the apartment and the amenities available. He provided his mobile phone number for contact if any assistance was required. On the day of check-out, Lorenzo met me at the agreed check-out time for the handover of the keys.
The location is definitely one of the apartment's greatest benefits. As stated in the listing, the Colosseum and Colosseo Metro station are just a few minutes walk away. I have to say I rather enjoyed being able to see the Colosseum just a few steps after stepping out of the gate of the apartment building during my time there. Apart from being already within walking distance of several major historical sites, the Colosseo Metro is only 2 stops away (a ride of just several minutes) from Roma Termini, the central train station, which gives excellent access to the other Metro stations in Rome. I could conveniently get to the sites within Rome's historical centre due to this. A thing that's not mentioned in the listing though is that although the apartment is a very short distance from the Colosseo Metro, as the crow flies, the apartment building is at a level above the station. You will need to walk a bit along the sidewalk from the station to get to a flight of stairs to reach the apartment, and it's a high (but very wide) flight of stairs. I did not find any ramped access to the area in the proximity during the few days I was there. Just something to keep in mind if you intend to bring heavy luggage for your trip.
In terms of the apartment itself, it is bright, cosy and modern. Very clean. The apartment is as in the listing's photos and nicely decorated. Amenities of adequate quantity were supplied and the kitchenette was well stocked with cooking utensils. There was Wi-Fi and satellite TV available for entertainment. I didn't find anything amiss and had a comfortable time while staying there.
In summary, a very nice place to stay. I'd recommend it if you're visiting Rome in a group. Thanks for the excellent stay, Valerio!!