This is my first stay at an ABA and I have to say that the experience was AWESOME! Piero and his wife are the best hosts that you may ever find. Very attentive and professional. The apartment is literally across the street from the Vatican Museum. The entrance to St. Peters is about a 5 minute walk around the block. The Colosseum/Spanish Steps/Trevi fountain are approximately 25 minute walk (10-15 minutes by Metro at a cost of 1.5 Euro per person one way). The walk is amazing and worth it. There are also many great restaurants in the area and Piero and his wife have great suggestions as to where you can eat or find anything you are looking for. In addition, there is a great market that is huge, right up the block that has amazing things you can buy, almost anything you can imagine. Everyday, Piero and his wife made sure we had coffee available as well as breakfast items.
The only issue would be the internet which was slow and most likely our fault because we had 9 people trying to use it at one time.