Besides the prior positive comments and the lucrative price, I have chosen to come to Rosario's house mainly due to work reasons, so I had no need to be near the city center.
If you seek a place to stay in for a few days (or a bit longer) in a home-type environment, I basically recommend it. The neighborhood is quiet, and it has supermarkets, restaurants, gyms, and public transportation nearby.
Take into account that the room which rented is inside Rosario's house, as well as the other described zones (bathroom, living room, kitchen, patio) so keep in mind to respect her house rules. Besides that, come at least with basic Spanish skills in order to communicate well with her.
Very good exprience!