Very nice apartment and welcoming hosts!
The apartment is on the third floor and you will use the stairs since the elevator is so slow. Supermarket and restaurants very close by. There is a shower but is a bit hard to see in the pictures.
Terrace is on the fourth floor, we should have visited it more.
We took train from the airport and then 8bus from Trastevere train station. You can buy bus tickets at the cafeteria outside the train station.