Sergio was the perfect host! He is very kind and nice. The room and the toilet were very clean. He prepared a very tasted italian coffee for the breakfast, bread, butter and jam. The appartment is 15' walking from the Trastevere train station and you can get Trastevere bars and the center of Rome by taking the tram n. 8, at Gianicolense-Ponte Bianco which is 10' walking from the flat.
We stayed very comfortable there, and definitively recommend B&B Aquarium.