The host is a "super host" for good reason, I have never stayed at an airbnb (and I've stayed at many) where the host was more thoughtful, prepared, accommodating, responsive, etc. He is the best of the best. No issues at all, and it was perfect for a family's stay to include the location and convenience to public transportation. Everything was perfection (air conditioning, washer/dryer, comfortable furniture, everything in excellent working condition). If I ever stay in Rome again, I would like to stay there again!
For future reference for anyone considering to stay here: there was a taxi strike that was very short, but was unfortunately taking place on the morning of my arrival...so I went to the train station where I was able to book a shared-shuttle for 15 euros that took me to the Colosseum (versus 46 euros for a taxi). From the Colosseum, it was a very easy 7-minute walk to the apartment (with the help of google maps, direct walk on only 1 street). The shuttle is very easy to do and much less expensive - just walk to the train station right across the street from the baggage claim and go to the ticket counter where you buy a ticket for the train or shuttle...shuttle was more convenient because I didn't have to work very hard.