This was our first experience with Air BnB and it could not have been a more positive experience.
The description of the apartment is perfectly accurate - 2 King bedrooms with ensuite baths and a great living/kitchen area enhanced by the windows/doors/balcony. A perfect set-up for couples traveling together.
The building has a lift - we took the stairs except when we had luggage.
The location (across from Borghese Gardens) was about a 30/40 minute walk south to the Colosseum or west to the Vatican - just perfect to see the city and all of the sites in between.
The are excellent restaurants in the blocks surrounding the building but it was a very non-tourist neighborhood.
The host was away when we arrived for check in (skiing!) but her assistant Ana met us without delay and got us up to speed on the apartment (and leads on 2 of the restaurants we dined at). Valentina did drop in to make sure everything was going well and we would book space with her again without hesitation.
Rome is an old and magical place and I can honestly say that our experience was enhanced by the accommodations Valentina provided for us.