Highly recommended!
If you like to live in a traditional Roman quartiere, stay in Testaccio. The location of the apt is superb: Near great restaurants (try Osteria del Antico Forno, Felice and of course Pizzeria Remo), the market hall, a new organic super market, a small urban playground (suitable for the smallest ones), many cafes and gelaterias and across a book shop. Public transportation is only a short walk away: Trams and buses on Via Marmorata and subway at Pirámide.
The apt itself is in a traditional building with an elevator. The apt has been completely restructured and it´s now luminous, clean and quiet. The only minus is that it hasn't´t got a terrace nor balcony. Otherwise the apt is the best pick both for small families and solo travelers. Communication with Lia was always smooth. Our late check-in (around midnight) was not a problem. We will definitively stay here on our next trip to Rome.