We stayed at the Domus Sant'Angelo for four nights in June. The initial communication with Stefania was excellent and he responded to every question that I had....and there were lots!! Once we had made the booking the communication continued to be very good and Alexandra made sure that we were well prepared for what to do on arrival. On our arrival Alexandra met us at the apartment and made sure that we were comfortable. In advance she had prepared a handbook that outlined everything that we needed to know (not just about the apartment, but also the local facilities, places of interest, places to eat, etc).
The apartment itself is simple, and has certain a "rustic charm" to it. The roof terrace is a great place to relax with a glass of wine at the end of busy sight-seeing days. Finally the location is fantastic. Very central to Castel Sant'Angelo, Vatican CIty, Piazza Navona, Pantheon, Trevi Fountain, etc. (all within 20 minutes walk) It is surrounded by places to eat and drink. We walked to the Colosseum and the Forum on our last day in about 30 minutes too.
No complaints. Stefania and Alexandra were great hosts, and I would return to the apartment if I ever had the opportunity to visit Rome again in the future. You won't regret it.