I had a lovely stay at Luca and Francesca's. My room was spaceous and bright, the bed was comfy, and I'd gladly stay here again any time! The metro A is almost around the corner; you'll be able to get to Piazza di Spagna within about 25 mins or so from leaving the flat. This area has a couple of nice restaurants and late-opening mini-supermarkets, which was convenient. Thanks Luca!