The apartment is great! It is comfortable, well stocked, and in a great location. Our family stayed for a month with our two young children (4yrs. & 2yrs. old) and enjoyed it immensely. The beds are comfortable and the kitchen has everything you need to make a great meal when you aren't visiting all of the great restaurants close by. There were also numerous kid friendly items in the apartment like toys, kid towels, and a travel crib, which were very convenient.
The apartment is across the street from a park with a playground which our kids enjoyed on a daily basis after touring around the city using three different bus stops which are all only steps away. Testaccio is a great neighborhood which a community feel and a lot of authenticity. There's a supermarket a block away and a larger open air market a couple blocks beyond that, and the neighborhood is dotted with some great restaurants, cafes, and gelaterias.
Both my wife and I worked during our extended stay and we never had any issue taking video call or doing any other tasks, even when someone was streaming a movie in the other room. In fact, this apartment had the best wifi we experienced of any of the places we stayed in Italy.
Overall, we had a great stay. The apartment had everything we needed and I would highly recommend you to stay here!