TLDR version: Helpful and good host. Use train and/or subway; not the bus. Small elevators in Rome.
Cristina was very helpful and organized. Always available (through text messaging or calling) to respond to any question we had. Thankfully there wasn’t a lot. And our questions were’t even about the apartment :)
Location is good. It’s great that there is a subway station at a walkable distance and another train station that’s right next door. We used the subway to get to the city central and sights we wanted to see. The train we took to go to the beach (Santa Marinella) and to the airport.
It’s unfortunate that buses are not that reliable. We waited for the bus (#85 I believe) at two separate occasions. It never showed up, so the subway being close by helped. To be fair, we took it home once when we returned from the city central, so it’s not totally dysfunctional.
Most elevators (that I have seen) in Rome are small. So is the one in the apartment. So, if you have a lot of luggage, just be mentally prepared :)