I stayed with David and Caterina for nine (days). Both hosts are delightful people who became my friends. The spacious room on the 4th floor (with an elevator) has a view, the bed is very comfortable, the wi-fi excellent, the shared bathroom has a big shower with plenty of hot water, the kitchen has everything.
There is a coffee bar one block away, the Piramide Cafe', for breakfast Italian style (cappuccino and croissant) and an excellent restaurant two blocks away, the Osteria dei Fratelli Mori. The subway station Piramide and the Ostiense train station are 10 minutes' walk. All the major sites are easy to reach by subway and walking. The Colosseum, for example, is two subway stops from Piramide.
I recommend David's place without any reservation for a perfect stay in Rome.