Fabrizios apartment is very cute and clean and perfectly located in the heart of Trastevere (and at the same time ver quiet).
We had a nice stay - the only unpleasant experience was the sofa bed which I cannot recommend for anyone to sleep on, in particular not if you have back problems. The mattress is extremely thin and it feels like you're sleeping on the bare metal bedframe below. The actual bed on the other hand is very comfy so if you're only two people staying (or if you're the one who wins the bet for the real bed) it's a perfect place to stay.