We can do nothing but absolutely recommend this one.
We were 5 adults (husband, mother, grandparents, me), stayed for 2 nights, traveling by car.
Everything was exactly as described: appartment, fully equipped bedrooms, bath and kitchen, everything very clean.
It was a 10 minute walk to Vatican museums, 20 minute walk to St. Peter's cathedral and 10 minute walk to metro station (with the elderly of 80 years). We recommend the close mercato trionfale for grocery.
What made our experience so special were our hosts. They waited outside to keep a parking spot free for us. We were welcomed warm-hearted and immediately got recommendations for close bars an restaurants. When we had a medical emergency later that day they helped us find an open pharmacy and would have helped us with a doctor if necessary even though it was close to midnight.
That impressed us very much why we only can give the highest possible rating!!!