Simply put: great apartment, great location, wonderful host.
It's convenient to Metro B line (Piramide stop), regional train line, and train to airport, meaning you're only a few Metro stops from ancient center or Termini and can walk to trains for Ostia Antica or FCO. ATMs, restaurants (e.g., Remo, Da Felice), cafes (Barberini 'round the corner is a must), supermarket, gelateria, and pharmacy all less than five minutes' walk away. Living room looks down onto lively square (Piazza Testaccio); bedroom's on opposite end of apartment, overlooking inner courtyard and very quiet. Fast wifi, fridge, comfortable and quiet place to sleep, plus Giulia is a gracious and generous host--it's got everything you need.