We stayed at this lovely apartment in March 2017. We never met the host throughout our stay, everything was discussed with her friend, Anna, who was very helpful. The apartment is located on the fifth floor of an old house in a very nice neighborhood. I wouldn't say it was close to the city center - it's a long walk to the main attractions like Colosseum or Piazza Venezia, however if unlike us you prefer to use public transportation, you will find a subway station and a bunch of bus stops just around the corner. However, one of the key benefits is that the apartment is located extremely close to the Vatican City, that we enjoyed very much.
The apartment looked exacly like on the pictures, it was very bright and clean. The beds, however, were very hard, to the point that we did not use one bedroom, the bed there was very uncomfortable.
Apart from that, the place is fully equipped, has everything you might need. The only real problem that we had was the heater that did not work, but Ana was very kind to come and fix it the next day. Other than that we enjoyed the stay and would recommend this apartment.