My fiancée and I spent a few nights at B&B La Lupa and were absolutely satisfied with everything. Our room was clean and had its own bathroom, the kitchen was well-equipped. Breakfast at the nearby Dolce Café was exactly what we needed (cappucino & croissant). Finally, the location, being near tram line 8 (which takes you directly to the city centre) and Trastevere railway station (direct trains to Fiumicino Airport), were also very convenient.