In a nutshell: I would stay at Alessandra's again
Great location: ten minutes' walk from metro stop Piramide, which is 2 stops away from Colosseum and 4 from Termini, the main train station.
The appartament has everything you will need and is exactly as described. Alessandra left clean towels and had bought some snacks and new gel and shampoo. Everything was very clean and the neighbourhood is very pleasant.
The welcome was warm, Alessandra's husband was very polite, he waited until I arrived even though my bus left later, showed me around the appartament and gave me tips on how to use transport in Rome, shops nearby and recommended restaurants, which later Alessandra explained with more detail.