We stayed at Zolilla B & B for 3 nights (in room 1) and loved our stay. The B & B is very centrally located. We walked to all major sites including the Vatican (about 3 miles away but completely doable). There is easy access to two metro stops (Termini on Red and Blue line and Cavour on the red line) but it's also an easy, direct 10 min walk from Termini station.
The room is on a very busy road but very close to smaller streets that have less touristy restaurants and shops.
Each morning a great little breakfast was laid out in a nice arrangement. The kitchen is very well stocked with utensils, bowls, cups, etc. There is also a large assortment of teas! She also let us know that we were more than welcome to use the fridge to store any food items.
Wifi worked extremely well, rooms were very clean. The apartment also felt very secure as you're really up 3 flights of steps and the main door has a major deadbolt lock on it.
We very much enjoyed our stay and would definitely recommend this B & B.