Great apartment, highly recommended! Spotlessly clean, warm, cosy, large bedrooms and everything there what you need. One bedroom to the street might be noisy in summer but in italy you should always travel with ear plugs in case you have light sleep.
Easily reachable by airport shuttle, close to the Vatican, Metrostation only some minutes walk. Nice area for dining and shopping.
We were three adults and one child and felt like home there. Luigi was always available and reacted immediately to any question. Next time Casa Winkler would be our first choice in Rome!