Talking about location, this place is perfect. You have the coliseum at 25 minutes by foot, the Trevi fountain at 20 minutes to the other direction and you are near the Tiber river where during the night there are several options of restaurants.
Talking about the apartment. It's small, but comfortable, perfect for 1 or 2 people. It's a place to sleep and take a shower, more than enough for those who want to be in the city all the day.
Anna is really nice, she can give you several recommendations for activities and she answers the messages all the time.