We had a very enjoyable 3 days in Rome. We got a taxi from Ciampino airport (30 euro fixed fee). Karen was a friendly and helpful host. She lives in the same block which was handy but never intrusive. The apartment is on a quiet street at the edge of Trastevere. It has a lovely authentic and homely feel. The bedroom is very generously sized and everything was clean and tidy. Trastevere is a great part of town - lots of narrow streets to explore and plenty of good value restaurants. All the main sights are within walking distance (30-40 mins to Forum and Colosseum, 20 mins to St Peters). We would definitely stay in Trastevere at Karen's if we came to Rome again.