This is seriously a perfect apartment in a perfect location! Directly outside is Piazza del Popolo and Villa Borghese and all of the other big attractions are only minutes away on foot (The Colosseum being the farthest, but still only around a 30-minute walk)!
The apartment itself is more than spacious enough for one person or a couple, and is fully equipped with everything you might need and more! The hosts have included little things from laundry detergent, coffee capsules, and umbrellas to the everyday necessities. It is a great option for short stays, and even better for long stays. It should be noted, however, that the apartment is connected to the neighbors (with a shared entrance), but it is still completely private. The location is safe and as well as landmarks it is also nearby many amazing restaurants, cafes, museums, and shops.
Check-in was very easy, and Francesco has always been quick to respond and eager to assist with anything in the apartment or even just to give some good tips about the city. Luigi (the caretaker) is also a great immediate resource and an extremely kind gentleman willing to have nice conversations.
Overall I highly suggest staying here if you come to Rome. You won't regret it! :)