Ernesto's place is ideally situated: it is walking distance to the main sites, public transports and Trastevere is a great neighbourhood (bar, restaurants, etc.).
The apartment is big and you feel welcome. If you travel on your own, there are always people around in the kitchen or living room with whom you can discuss, share a meal, etc.

The only negative point would be the cleanliness of the bedroom and bathroom. However, it may be due to the fact that the cleaning person was coming right at the end of our stay.
Otherwise, even though sick, Ernesto was very nice and welcoming.

Overall, it is defintitely a place I recommend!