The stay in Maria's place was great, it is big and accommodated my family of 4 adults and 1 kid comfortably. Maria provided everything as advertised, apartment fully equipped, very clean and functional. Internet connectivity fast, AC worked smoothly.
Maria waited for us and was flexible based on our flight arrival time, so it was very easy to meet her. She is very nice and had for us some snacks.
The location is fine, tram 19 (last stop is the Vatican) and tram 5 (last stop is Termini train station) first stop is just in front of the building.
A negative note, "which is not related to the stay at Maria's place", is that Rome seems to be not so safe; in tram 19 going to the Vatican in the afternoon, a thief tried to steal my gold chain, the guy didn't succeed and then we were told by the locals that it was common, including pickpocketing and other stuff, so be aware of thieves and hide your belongings when in Rome, you should be fine then. Unlike other parts of Italy and Europe and the US where there is no real concern for that type of stuff.