We booked the apartment based on the pictures and location. When we arrived, both of our (high) expectations were exceeded.
The location is phenomenal at just steps from the Trevi Fountain. It was great to wake up as the sun was rising to get an almost tourist-less view of this popular landmark. It also made it very easy to continue finding our way back home, since I didn't need to worry about telling the cab driver any complicated directions... just "Trevi Fountain" in my ignorant English did the trick every time.
When we finally arrived to the apartment close to 2am, Flavio came downstairs and outside to meet us at the taxi, helping us with some of our luggage. The check-in process was smooth, especially since the communication provided prior to the trip was always timely, clear, and professional. He showed us everything we needed to know, pulled out a map and highlighted good areas to look for restaurants, and made sure we knew that we should contact him at any time with questions about anything, particularly restaurant recommendations in any part of Rome. We were on our honeymoon, and I asked for a bottle of champagne for our arrival (Happy Wife, Happy Life, or so she tells me...). They had it chilled and waiting on ice as we walked in.
The apartment is big and clean, and surprisingly quiet given the bustle in the narrow streets below (open the windows to hear it all, or keep them closed for a quiet oasis). It was just the two of us, so we only used the one bedroom and bathroom, but they are both equally beautiful, clean, and comfortable. One bathroom has the shower (and what a shower it is!), the other has the jacuzzi tub (perfect location for enjoying that bottle of champagne).
The AC works great. The kitchen is stocked well with pots, pans, and utensils. There is an elevator. The lighting is fancy, if a bit complicated to figure out which switch is for which set of lights (not a big deal, really just adds to the charm and mystery of the place).
Overall, we couldn't have been more pleased with this place. Flavio and Federico were great to deal with, and always very helpful. You're getting a worry-free stay with these guys.