We were in a group of 6 adults, between late December 2013 and early January 2014, in the apartment of Mr Orsi. The apartment is spacious, comfortable, well maintained and well equipped. Two beds are great, but my wife and I slept on a sofa bed that brought some discomfort.The heating worked properly and we noticed that there air conditioning (split model) in the bedrooms for hot days in Rome.The building is nice, quiet and easy to get a lift to the 3rd floor (but use the ladder it's no a sacrifice). The location is great: just a few meters from the Colosseum, Imperial Forum and Palatine Hill area. Piazza Venezia, Campidoglio, Teatro di Marcello, Circo Massimo, Largo di Torre Argentina, Via Nazionale, Via del Corso and other great attractions are also close enough to walk a few minutes. Moreover, the Colosseo station (Metro Line B) is almost beside the building and several bus stops/lines are nearby, which facilitates the shift to other places of interest like the Vatican, Villa Borghese, Piazza Spagna, Piazza del Popolo, Piazza Navona, Fontana di Trevi, Pantheon, Trastevere etc... Despite a very tourist area, going toward the Monti neighborhood (near Via Cavour) you find restaurants, emporiums, cafes, grocery stores, more local or authentic shops.
Finally, Mr Lorenzo Orsi was a very kind host and kept fast and objective communication from booking to the end of our stay.
So my family and I had a very pleasant experience at this property and I recommend it to the Airbnb community.