I warmly recommend Elisabettas place The Loft. Easy welcoming from the host, no stress, rustique atmosphere and all you need for nice simple breakfast & coffee is integrated. The heat was perfectly on in cold January.
Even though I dont bother noises from the street and around, I understand that some might react on this.
Good recommendings printed out for you, and perfect location for you who want to live in cosy Trastevere. Perfect for girlfriends and couples :)