The apartment itself was ok. Nothing extra ordinary. As others have also pointed out, the shower was quite small. This we knew when we booked.
We booked this particular place because of the roof terrace, which was absolutely fantastic and with a great view.
The area was nice and local. Not touristic yet only 20 minutes walk away from the centre of Trastevere. The Sur Eva restaurant right on the Piazza del Rovere is highly recommendable. And only ten minutes walk from St Peter's church. Good bus connections to other parts of Rome. But also quite walkable.
All in all a lovely place, which we highly recommend and would like to stay again.