Lucia's place was the very first AirBnB I have ever been in and it quickly became THE AirBnB against which I compared others with after that. Her place was simply and frankly the best among all the others I have experienced.
First, the location was very good, only a mere 5mins walk from the Roma Termini. There were also a lot of good restaurants nearby to dine in. The room has a private bathroom inside, complete with all the amenities you may need like towels, soap, shampoo, tissues. The room has airconditioning, but you have the option whether to rent it or not. 2 nights cost us only €5, and we get to have a comfortable cool sleep. The wifi connection was good and fast. There is a lift/elevator in the building. And also, she provides daily breakfast stubs which you can claim/eat at the Ola Bar which is located just behind the building. Nothing fancy, just a croissant and your choice of coffee but it was very much appreciated, since a lot of AirBnB don't offer any breakfast at all. And before I forget, Lucia was a sweet old lady and she will be available always to help you with anything.
I really recommend Lucia's place if you want value for your money without sacrificing comfort.