Just finished a weekend at Snow White Rome location. Neighborhood is a bit on the outside but Pantheon, Trevi and Spanish steps are a walking distance (a good walk...). Taxi's were not very expensive to get to other places. MyTaxi app will be helpful in Rome. The apartment was spacious and plenty of room to relax after a long day. Beds were comfortable, and yes neighborhood is city streets so it's noisy but honestly we were so tired it did not matter.
We really enjoyed our first AirBNB experience and will certainly do it again.