My wife and I stayed in this apartment for a week. We enjoyed our stay very much and recommend it. The location is in the heart of Rome, close to everything. There are many good restaurants within a short walk including a good one right next door on the street level.
The apartment, in a very old building, has an entrance on the 6th floor (US style floor numbering). An elevator takes you to the 5th floor, then up one flight of stairs. The apartment itself is on two floors, we basically lived on the top floor (7th). The top floor has two bedrooms, two bathrooms and a nice living room as well as a two level verandah with fabulous views of Rome. The bed was very comfortable. Plenty of room for our clothes. The bathrooms were very nice too, although small. The kitchen had everything we needed for our weeks stay. We had our breakfast in and sometimes lunch but ate out most evenings.
The wifi works best in the bedroom where the router is located. Mateo answered our questions promptly, and set up a private driver to take us from the airport to the apartment. Gabriela was a gracious host who enthusiastically introduced us to the apartment.