We were kindly welcomed by the Simona's brother (I think!!) who were waiting for us when whe got there. Thanks to him!!
The apartment was very clean and very well located (20 min walk from the trastevere train station and 10 min walk to the center of Roma). Bike were available to us.
The negative thing is the flat was very dark (excepted in the bedroom) and the area not the prestiest.
But it was a very nice time in Roma for us!!

Thanks to Simona!!