We stayed for five nights and the apartment was perfectly equipped for our grown up family of four. Beds are comfy, facilities are spotless, effectively all brand new and whilst obviously a city centre location, nights are peaceful with good sound proofing.
Location wise, it is well positioned for all the attractions and many good restaurants where walking across the street immediately puts you into the network of attractive streets that stretch across Rome, south via the Trevi Fountain to the colosseum area or west via the Pantheon and Piazza's to the Vatican. If you have time, spread out the attractions and relax in some of the parks or near Castel Sant Angelo listening to the many talented buskers in the sun. We visited at the start of March - 5 days of sun, no queues and no need to book restaurants.