The whole experience was flawless. To start with, I arrived early in Rome and needed to drop off my luggage much before check in time. Maria made no fuss about it. Then, the apartment itself: it seems to have been recently renovated and it is very well equipped. We cooked most of the evenings and we did the laundry. The neighborhood is magical. You feel Roman life pulsing in Trastevere. Since it was my first time in the area, I was surprised to realize how close it is to everywhere. The tramway stops just outside the front door, but you don't really need it. Piazza Navona is barely 10 minutes away in a very pleasant walk. There's a supermarket around the corner and my favorite discovery of this time in Rome: the restaurant Pianostrada, about 500m away through the narrow, crooked streets of Trastevere.
All in all, I strongly recommend the place and I am for sure returning as frequently as possible.
Thanks Maria!